Kathryn Hayward is an American physician and integrative medicine pioneer who served as an internist at Massachusetts General Hospital and an Assistant Professor at Harvard Medical School for over two decades. After retiring from clinical practice, she co-founded International Integrators and Living Whole Online alongside her husband, David Thomas Jr., promoting plant-based nutrition, mind-body healing, and holistic wellness globally from Mallorca, Spain.
Quick Bio — Kathryn Hayward, MD
| Full Name | Kathryn Hayward, MD |
| Born | Springfield, Massachusetts, USA |
| Education | Bay Path University; Mount Holyoke College (BA, American Studies, 1978); Boston University School of Medicine (MD, 1986) |
| Profession | Physician, Integrative Medicine Educator, Author |
| Hospital | Massachusetts General Hospital (MGH) |
| Academic Post | Assistant Professor of Medicine, Harvard Medical School |
| Private Practice | Odyssey Journey: A Collaborative Approach to Wellness (founded 2004) |
| Organizations | International Integrators (co-founded 2007); Living Whole Online |
| Book Published | Odyssey Family Systems Companion Guide (2013) |
| Husband | David Lloyd Thomas Jr., JD |
| Children | Jeremy Hayward-Thomas; Hilaria Baldwin (née Hillary Lynn Hayward-Thomas) |
| Current Residence | Inca, Mallorca, Spain (since 2011) |
Who Is Kathryn Hayward?
When people search for the name Kathryn Hayward today, they often arrive through the door of celebrity news — specifically as the mother of Hilaria Baldwin, the yoga instructor married to actor Alec Baldwin. But reducing Dr. Hayward to a footnote in someone else’s biography would be a serious injustice. She is, in her own right, a physician of significant academic standing and a pioneering force in the integrative medicine movement in the United States and beyond. Her life is a story of dedication, reinvention, and deeply held belief that healing must encompass the entire human being — body, mind, and spirit.
Born and raised in Springfield, Massachusetts, Kathryn grew up in a family that prized hard work and community. Her father, Charles “Chuck” Hayward, spent nearly four decades at a local power company, and her mother, Irene Webler, came from the same proud New England stock. That grounded, purposeful upbringing gave Kathryn a sense of responsibility toward others that would later shape her medical philosophy. From a young age, she seemed drawn to the idea of service — and medicine, with its promise of direct human impact, became her calling early in life.
From Bay Path to Boston University — A Scholar’s Educational Journey
Kathryn Hayward’s academic path was both deliberate and impressive. She began at Bay Path University, completing foundational coursework before transferring to Mount Holyoke College, a prestigious liberal arts institution in Massachusetts, where she earned her Bachelor of Arts in American Studies in 1978. The interdisciplinary nature of that degree — blending history, culture, and social analysis — gave her a broader lens through which to understand the human condition, a lens she would later bring directly into her medical practice.
Her most defining educational milestone came in 1986 when she graduated from Boston University School of Medicine with her MD. This degree was not merely a credential; it was the culmination of years of intellectual preparation and personal commitment. BU’s School of Medicine, known for its emphasis on patient care and social responsibility, aligned perfectly with the kind of physician Kathryn aspired to become. She would go on to build one of the most thoughtful careers in her field, beginning at one of America’s most prestigious hospitals.
Two Decades at Massachusetts General Hospital and Harvard Medical School
Following her medical degree, Kathryn Hayward built a distinguished 20-year career at Massachusetts General Hospital (MGH), serving as a primary care internist, and simultaneously held the title of Assistant Professor of Medicine at Harvard Medical School — one of the most competitive academic appointments in American medicine. These were not ceremonial roles. She treated patients, contributed to medical education, and engaged deeply with the institution’s mission of advancing healthcare knowledge. Her dual role bridged the gap between bedside care and academic rigor.
During her time at Harvard and MGH, she also served as a representative to the Academic Consortium for Integrative Medicine and Health — Harvard’s contribution to a national conversation about expanding medical practice beyond pharmaceuticals and procedures. From 2011 to 2013, she served as core faculty of the Leadership and Education Program for Students in Integrative Medicine (LEAPS into IM), and in 2013 she served as its Program Director. These leadership roles reflected her growing conviction that medical students needed to be trained not just in diagnostics, but in holistic human understanding.
What Is Integrative Medicine and Why Did Dr. Hayward Champion It?
Integrative medicine is a philosophy of healthcare that treats the whole person — not just the disease. It draws on the best of conventional medicine while incorporating evidence-based complementary practices such as plant-based nutrition, physical movement, stress reduction, and mind-body-spirit disciplines. For Kathryn, this wasn’t a trendy wellness buzzword; it was a carefully reasoned clinical approach born from years of observing what conventional treatment alone could not fully address. She saw patients with chronic conditions improve dramatically when their lifestyle, emotional health, and community connections were also attended to.
Her role as core faculty in HEART-IM (Humanistic Elective in Activism and Reflective Transformation and Integrative Medicine) in 2014 and 2015 showed her commitment to training the next generation of compassionate doctors. Both LEAPS and HEART programs were supported by the American Medical Student Association, lending them national legitimacy. She was not just practicing integrative medicine — she was institutionalizing it at America’s most respected medical school. That is a rare and meaningful distinction in any professional career.
Founding Odyssey Journey — A New Kind of Medical Practice
In 2004, while still associated with Harvard, Kathryn Hayward took a bold step by creating her own private integrative health practice called Odyssey Journey: A Collaborative Approach to Wellness. This was not a conventional doctor’s office. Odyssey Journey operated on the understanding that illness is often rooted in complex personal and family history, and that lasting healing requires addressing those roots. Patients came not only with unresolved symptoms but also seeking a second opinion, deeper understanding of their diagnosis, or practical guidance on how to cultivate lasting wellbeing.
The practice offered consultations via Skype, phone, and in-person sessions — a remarkably forward-thinking model that anticipated the telemedicine boom by over a decade. In Odyssey Journey, Dr. Hayward brought together her expertise in conventional internal medicine with Family Systems work, plant-based nourishment guidance, physical movement, and mind-body-spirit practices. She treated the person seated in front of her as a whole story — not a collection of symptoms. This deeply personal, collaborative model became the philosophical blueprint for everything she would later build on a larger scale.
International Integrators — Taking Wellness to a Global Stage
In 2007, Kathryn co-founded International Integrators LLC alongside her husband David L. Thomas Jr. The organization was built around a deceptively simple but radical idea: that integrative health is not just for elite clinics or wealthy wellness retreats, but a global human right worth promoting across cultures and continents. International Integrators brought together practitioners, educators, and seekers from around the world through its weekly blogs, educational programs, and its signature Living Whole Immersions — five-day retreats held in both California and Spain.
The collaborative structure of International Integrators reflects Kathryn’s belief in collective action. She has often spoken of her admiration for the power of like-minded individuals coming together to create meaningful change. The organization is not a top-down wellness brand; it is a community. Practitioners share their knowledge, participants return year after year, and the conversations that happen in those Mallorca retreat spaces often lead to profound personal transformation. It is one of the most genuinely community-driven wellness platforms in the integrative health space today.
Living Whole Online — Bringing the Retreat Into Every Home
Recognizing that not everyone could travel to Spain or California for a five-day immersion, Kathryn and her collaborators launched Living Whole Online in 2020. This digital platform extended the reach of International Integrators into living rooms worldwide, offering educational content on conventional medicine, whole plant-based food, physical movement, and mind-body-spirit disciplines including family connection practices, energy work, art, music, writing, photography, and filmmaking. It was a comprehensive vision of wellness that refused to separate physical health from creative and spiritual wellbeing.
The timing of Living Whole Online’s launch during the COVID-19 pandemic proved both fortuitous and purposeful. As millions of people worldwide grappled with isolation, anxiety, and uncertainty about their health, the platform offered a thoughtful, evidence-informed alternative to the chaotic wellness content flooding the internet. Dr. Hayward’s conventional medical background gave the platform credibility while her integrative philosophy gave it depth. Today, Living Whole Online continues to grow as a trusted resource for people seeking a whole-person approach to lasting health.
“Real healing must include the mind, the body, and the spirit — addressing only one dimension of a person’s suffering is like treating a forest fire with a cup of water.”
The Odyssey Family Systems Companion Guide — Her First Published Book
In 2013, Kathryn Hayward published her first book, the Odyssey Family Systems Companion Guide, available on Amazon Kindle in both English and Spanish. The book explores the relationship between family history, interpersonal dynamics, and adult health outcomes — a field known broadly as Family Systems theory. Her thesis, drawn from years of clinical observation, was that understanding the emotional and relational patterns inherited from one’s family of origin is often the key to unlocking persistent health challenges that conventional medicine alone cannot resolve.
The dual-language publication of the book in both English and Spanish was a deliberate choice reflecting her deep connection to Spanish culture and her desire to reach a broader, more diverse readership. Families in Spain and Latin America, where Dr. Hayward had spent significant time, often hold different cultural frameworks around illness, identity, and intergenerational relationships. By making her insights accessible in Spanish, she extended her reach into communities that might otherwise have been underserved by English-language wellness literature. The book remains a useful resource for patients in her private practice and for those discovering her work online.
The Move to Mallorca — Spain as a Spiritual and Professional Home
In 2011, after two decades of distinguished service at MGH and Harvard, Kathryn and her husband David retired from their Boston-based professional lives and relocated to Inca, a small historic town in the interior of the island of Mallorca, Spain. This was not an impulsive retirement escape. The couple had been frequent visitors to Spain for years, and the island had long captured their imaginations with its slower pace, extraordinary food culture, natural beauty, and warm community spirit — all values that resonated deeply with their integrative wellness philosophy.
Living in Mallorca allowed Kathryn to practise what she preached. The Mediterranean lifestyle — abundant fresh produce, daily physical activity, strong social bonds, and a less pressured relationship with time — aligned perfectly with the pillars of integrative health she had spent decades championing. The island also became the geographic home of the International Integrators Living Whole retreats, giving participants an immersive environment that reinforced the wellness principles being taught. Mallorca was not just a retirement destination; it was the living embodiment of her life’s work.
Kathryn as a Mother — Raising Hilaria Baldwin and Jeremy Hayward-Thomas
Beyond her professional achievements, Kathryn Hayward is the mother of two children: Jeremy Luke Hayward-Thomas and Hillary Lynn Hayward-Thomas, better known to the world as Hilaria Baldwin. Hilaria, born in Boston in 1984, grew up in a household where Spanish was spoken alongside English, and the family took frequent trips to Spain — a cultural immersion that became central to Hilaria’s identity. Hilaria later married actor Alec Baldwin and became a prominent figure in the wellness space as a yoga instructor and author, a path that bears unmistakable echoes of her mother’s values.
The parenting approach Kathryn and David took was clearly shaped by their shared belief in cultural curiosity, physical wellness, and meaningful work. Their children grew up understanding that health was not just about avoiding illness but about living fully and consciously. Jeremy Hayward-Thomas has maintained a lower public profile than his sister, but the family’s closeness is evident in the way Kathryn speaks about her children and grandchildren in her writing. She is proud of the family she and David have built — one rooted in shared values, not just shared DNA.
Who Is David Thomas Jr.? The Man Behind the Mission
David Lloyd Thomas Jr. was born in 1949 in Massachusetts to David Lloyd Thomas Sr. and Mary Lou Artman. He attended Scarsdale Senior High School before earning his undergraduate degree with honors in Spanish Literature from Haverford College, Pennsylvania, in 1971. He then pursued his Juris Doctor at Georgetown University, graduating in 1974. For the next four decades, David practiced law and ran businesses in Boston, building a successful professional life rooted in discipline, strategic thinking, and a deep love for Spanish culture that began in his college years and never left him.
David’s connection to Spain was not merely academic or nostalgic — it was a lived passion that he brought into family life. He and Kathryn regularly visited Spain as a family, and their children grew up immersed in Spanish language and culture. After retiring in 2011, David earned a Certificate in Plant-Based Nutrition from the T. Colin Campbell Center for Nutrition Studies at Cornell University, demonstrating that his commitment to integrative wellness was more than spousal support — it was a personal transformation. From 2014 to 2015, he facilitated the food and nutrition program for the HEART-IM medical student program at Harvard, proving that he, too, had become a credible voice in the wellness education space he and Kathryn shared.
The Partnership That Powers International Integrators
The story of Kathryn Hayward and David Thomas Jr. is, at its core, a story about how two very different professional backgrounds can merge into something greater than either alone. Kathryn brought medical authority, academic credibility, and clinical insight. David brought legal and business acumen, financial infrastructure, and a gift for facilitation — particularly around food, where he became the culinary face of the International Integrators Living Whole Immersions. Their partnership is not merely romantic; it is genuinely collaborative in the truest professional sense of the word.
David co-founded the Integrative Health Collaborative in Boston in 2007 alongside Kathryn, and together they have built an organization that has outlasted trends and maintained genuine integrity. He facilitates the food and nutrition program at International Integrators retreats, sharing his experience of thriving in the demanding worlds of business and law while sustaining a whole-food, plant-based lifestyle. His story speaks directly to the audience that most needs to hear it — high-achieving professionals who feel that healthy living is incompatible with their demanding careers. David Thomas Jr. is living proof that it is not.
Their Shared Belief in Whole-Person, Plant-Based Wellness
One of the most distinctive aspects of the wellness framework that Kathryn and David have built together is its emphasis on whole, plant-based food as a foundational pillar of health. This is not a fad diet philosophy — it is grounded in decades of scientific research, most notably the work of Dr. T. Colin Campbell, whose landmark study “The China Study” provided extensive epidemiological evidence linking plant-based diets to dramatically reduced rates of chronic disease. Kathryn even appeared in the 2015 documentary PlantPure Nation, produced by Campbell’s son Nelson, deepening her public association with the plant-based health movement.
For David, the plant-based lifestyle became a personal revelation. After earning his Cornell nutrition certificate, he embraced the kitchen as a creative space and now regularly teaches retreat participants how to prepare delicious, nourishing whole-food meals. For Kathryn, the evidence-based argument for plant-based eating aligns perfectly with her broader clinical philosophy — that food is medicine, and that what we put in our bodies has profound consequences for our emotional and physical wellbeing. Together, they model the integrated lifestyle they teach, which lends their programs an authenticity that no marketing campaign could manufacture.
The Relationship Between Kathryn Hayward and David Thomas Jr. — A Life Built in Tandem
It would be reductive to describe the bond between Kathryn and David as simply a loving marriage, though it is certainly that. Theirs is a relationship built on intellectual partnership, shared purpose, and an evolving commitment to living well. They met, married, and raised two children together in Massachusetts, but the arc of their life together has never been static. Each phase — from Boston’s medical and legal corridors to the sun-drenched hills of Mallorca — has represented a conscious choice to keep growing, keep contributing, and keep reinventing what a meaningful life can look like in later years.
Their decision to retire at a relatively young age and relocate to Spain was, in many ways, the ultimate expression of their shared wellness philosophy. Rather than accumulating prestige and assets until age made such choices difficult, they chose to live their values while they still had the energy to build something remarkable. International Integrators and Living Whole Online are not passion projects born from boredom in retirement — they are the sophisticated culmination of two lifetimes of professional learning, finally freed from institutional constraints. David Thomas Jr. is, in every meaningful sense, co-architect of the wellness legacy that Kathryn Hayward has created.
Why Kathryn Hayward’s Work Matters More Than Ever in 2026
In a world increasingly overwhelmed by health misinformation, wellness gimmicks, and an overburdened conventional medical system, the model that Kathryn Hayward has spent her career building offers something genuinely rare: rigorous, evidence-based, compassionate care for the whole person. Her background as a Harvard-trained internist gives her the credibility to navigate the science, while her deep commitment to mind-body-spirit disciplines gives her the wisdom to go beyond it. This combination — clinical precision plus human depth — is what separates her approach from both conventional medicine and new-age wellness culture.
The community she and David have built through International Integrators continues to expand its global reach, with practitioners and participants from multiple continents contributing to a shared vision of health that honors both the individual and the collective. As chronic disease rates rise globally, as mental health challenges multiply, and as people increasingly seek healing that the standard fifteen-minute GP appointment cannot provide, the integrative model that Kathryn Hayward has championed for decades is not a niche alternative — it is the future of medicine. Her work, and the life she has lived alongside David Thomas Jr., stands as compelling proof.
Conclusion
Kathryn Hayward, MD is far more than a famous mother-in-law or a retired Harvard doctor living quietly in Spain. She is a tireless architect of a more humane, comprehensive, and effective vision of human health. From her early years in Springfield, Massachusetts through her distinguished career at MGH and Harvard, to her bold reinvention in Mallorca alongside her husband and co-founder David Thomas Jr., she has consistently pushed medicine beyond its comfortable boundaries. Her work — through Odyssey Journey, International Integrators, Living Whole Online, and her published writing — offers a roadmap for anyone seeking a deeper, more integrated experience of wellbeing. In a noisy wellness landscape, her voice remains one of the clearest and most credible guiding lights available.
Frequently Asked Questions
Who is Kathryn Hayward?
Kathryn Hayward, MD is an American physician, integrative medicine pioneer, and co-founder of International Integrators. She is also known as the mother of yoga instructor Hilaria Baldwin and the wife of former lawyer David Thomas Jr.
Where did Kathryn Hayward study medicine?
She earned her MD from Boston University School of Medicine in 1986, after completing her undergraduate education at Bay Path University and Mount Holyoke College.
What is Kathryn Hayward’s connection to Harvard?
She served as an Assistant Professor of Medicine at Harvard Medical School while simultaneously working as an internist at Massachusetts General Hospital — roles she held for over 20 years.
What did Kathryn Hayward and David Thomas Jr. co-found?
They co-founded International Integrators LLC in 2007 and later launched Living Whole Online in 2020 — both organizations dedicated to promoting integrative health globally.
Where does Kathryn Hayward live now?
She and her husband David Thomas Jr. retired in 2011 and relocated to Inca, a town on the island of Mallorca, Spain, where they host their international wellness retreats.
Who is David Thomas Jr.?
David Lloyd Thomas Jr. is a former Boston lawyer, Spanish literature graduate from Haverford College, and Georgetown-trained attorney who co-founded International Integrators and facilitates the food and nutrition programs at Living Whole retreats.
Has Kathryn Hayward written any books?
Yes. In 2013, she published the Odyssey Family Systems Companion Guide, available on Amazon Kindle in both English and Spanish, exploring how family dynamics influence adult health outcomes.
