Harvard Catalyst Profiles

University of Thessaly, Larissa, Greece	MD	07/2014	Medicine
Third Department of Internal Medicine, Evangelismos General and Peripheral Hospitals, Athens, Greece	Resident doctor in Internal Medicine	03/2017	Internal Medicine
Division of Diabetes, Endocrinology & Metabolism, Imperial College London, London, UK	Visiting Clinical Research Fellow	12/2017	Diabetes, Endocrinology & Metabolism
Queen Elizabeth Hospital Birmingham, UHB NHS Foundation Trust, Birmingham, UK	Honorary Clinical Research Fellow	01/2020	Diabetes, Endocrinology & Metabolism
Maastricht University, Maastricht, The Netherlands	PhD	10/2023	Human Metabolism and Obesity
University of Birmingham, Birmingham, UK	PhD	12/2023	Human Metabolism and Obesity
Harvard Catalyst Certificate Program, Harvard University, Boston, USA	Certificate Program	07/2025	Applied Biostatistics
Harvard Medical School, Boston,USA	Research Fellow in Medicine		Medicine, Sleep Medicine, Chronobiology
Brigham and Women’s Hospital, Boston, USA	Postdoctoral Research Fellow		Chronobiology, Chrononutrition, Human Metabolism

Dr. Lempesis is a postdoctoral researcher at Brigham and Women's Hospital (BWH) and Harvard Medical School (HMS) and a member of the Medical Chronobiology Program (MCP). His research focuses on integrative human metabolism, circadian rhythms, chronobiology, and chrononutrition, integrating clinical and translational approaches and utilizing controlled human studies to investigate metabolism and physiology in vivo.
Dr. Lempesis holds an MD from the University of Thessaly, Greece, was the top-of-the-class student and valedictorian of his class, for which he has received several awards for academic excellence, and a joint double PhD in human fat tissue biology and obesity from the University of Birmingham, UK, and Maastricht University, the Netherlands. His doctoral research, entitled "Body Fat Distribution and Obesity: A Comparison of Upper and Lower Body Adipose Tissue Biology in Humans," provided critical insights into regional adipose tissue function and its implications for metabolic health.
At BWH, Dr.Lempesis is expanding his expertise in human metabolism and circadian biology, aiming to understand better the pathophysiological background and interconnections of chronobiology and human metabolism and to develop novel interventions for obesity, diabetes, and cardiometabolic disease prevention.
Dr. Lempesis was recently awarded a prestigious American Diabetes Association (ADA) postdoctoral fellowship award entitled "The effect of temporal macronutrient distribution on 24h metabolism in humans."

• Integrative Human Metabolism and Physiology
• Adipose Tissue Function
• Obesity
• Chrononutrition
• Chronobiology
• Metabolism
• Circadian Rhythms
• Glucose Tolerance
• Energy Expenditure
• Nutrition
• Diabetes