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General Preventive Medicine Residency


Program Director

Clarence LamClarence Lam, MD, MPH serves on faculty and as the program director of the preventive medicine residency program at the Johns Hopkins Bloomberg School of Public Health. Lam is a Phi Beta Kappa graduate of Case Western Reserve University where he completed his Bachelor of Arts in political science and biology. He earned his medical degree from the University of Maryland and his Master of Public Health from Johns Hopkins University. He completed his residency training at Johns Hopkins, where he also served as chief resident, and is board-certified in preventive medicine.

In November 2014, Clarence Lam was elected to serve as a state delegate representing District 12, which includes both Howard and Baltimore Counties, in the Maryland General Assembly, where he currently serves on the House Environment and Transportation Committee. He is one of only four physician-legislators currently in the Maryland General Assembly.

While in medical school, Lam was elected as the student-body president of the University of Maryland, Baltimore, and he interned on the health affairs staff of the Committee on Oversight and Government Reform of the U.S. House of Representatives where he assisted oversight investigations on drug safety policy. He also served as a biodefense analyst at the Center for Biosecurity of the University of Pittsburgh Medical Center and authored several publications on public health preparedness. From 2009-2014, he served on the legislative staff of Delegate Dan Morhaim, MD in the Maryland General Assembly.

Clarence Lam is involved in many community organizations and serves on several non-profit boards of directors, including Healthy Howard, Unified Community Connections (formerly the United Cerebral Palsy of Central Maryland), and as board chair of the Community Action Council of Howard County, which manages the county’s food bank, Head Start program, and provides for energy and housing assistance to residents in need. He was a past appointee to the Governor’s Commission for Asian Pacific American Affairs and to Howard County’s Spending Affordability Advisory Committee.

Clinical Director


Kimberly Gudzune, MD MPH, FTOS is board-certified in Internal Medicine, a diplomat of the American Board of Obesity Medicine, and a Fellow of The Obesity Society. She received her bachelor’s degree in environmental biology from the University of Colorado. She attended Tulane University in New Orleans, Louisiana, where she received her doctor of medicine and master of public health degrees. She completed her training in internal medicine at the University of Maryland Medical System. After residency, she completed a clinical research fellowship within the Division of General Internal Medicine at the Johns Hopkins University School of Medicine. She joined the faculty of the Johns Hopkins University School of Medicine as an Assistant Professor in 2012. She currently practices as an obesity medicine specialist at the Johns Hopkins Digestive Weight Loss Center.

Gudzune’s research focuses on obesity, specifically how patient obesity influences the healthcare experience, the efficacy of commercial weight-loss programs, and how features of the built and social environment influence diet and exercise habits among low-income urban populations. Her research has won several awards, in addition to being featured by news outlets including The New York Times and National Public Radio. She has been recognized for her outstanding mentoring of trainees with the 2015 Frederick L. Brancati Excellence in Mentoring Award at Johns Hopkins. Gudzune joined the Preventive Medicine Residency in 2018 as Clinical Director.


Academic Directors

Elham HatefElham Hatef, MD, MPH serves as faculty at the Center for Population Health IT (CPHIT) in the Department of Health Policy and Management and as the academic director of the Johns Hopkins General Preventive Medicine Residency Program. As the academic director of the program she provides training and mentorship to the residents throughout their residency. She earned her medical degree from Tehran University of Medical Sciences, in Tehran, Iran and her Master in Public Health from Johns Hopkins Bloomberg School of Public Health (JHSPH).  Hatef completed a preliminary year in Internal Medicine at Yale-affiliated Griffin Hospital in Connecticut and Preventive Medicine Residency and Chief Residency at JHSPH. She then completed Clinical Informatics Practice Pathway at JHBSPH.  Hatef is board certified in Preventive Medicine-Public Health and Clinical Informatics.

Her main field of interest is population health, social determinants of health and health information technology. She studies the impact of social determinants of health on health-related outcomes using health IT and Big Data. She is involved in a number of projects in this area. At CPHIT she has served as the project leader on the development of population health framework and measurements for Maryland, a collaboration with CRISP (Chesapeake Regional Information System for our Patients) supported through Maryland State Improvement Model and Centers for Medicare and Medicaid Services. She also led the project to incorporate relevant available community/population level data sources into the Veterans Health Administration (VHA)'s electronic health records. This project aimed to evaluate the health outcomes such as hospitalization rate at the primary care level while addressing social determinants of health. In addition, in collaboration with other faculty at CPHIT she works on new methods of data mining and natural language processing to address social determinants of health using structured and non-structured electronic health records (EHR) data and publicly available population level data such as U.S. Census.

Mary Carol Jennings Mary Carol Jennings, MD is a board-certified physician in Public Health and General Preventive Medicine and holds faculty appointments with the International Health Department and General Preventive Medicine Residency (GPMR) of the Johns Hopkins Bloomberg School of Public Health. She currently serves as co-investigator on a Jhpiego-lead study on the measurement of stillbirth and early neonatal mortality in Tanzania, and on a GPMR-lead study on the health behavior impact of an innovative lifestyle medicine initiative into community-based primary care in Baltimore. Before joining the International Vaccine Access Center as the Project Director of the Rotavirus Accelerated Vaccine Introduction Network, she served as the Chief Resident of the Hopkins preventive medicine residency program, and has held multiple leadership roles in policy and advocacy with a variety of domestic and international health professional organizations and non-profits. She holds an MPH from the Johns Hopkins Bloomberg School of Public Health and an MD from the University of South Carolina.

Jennings’ research interests blend scientific inquiry with public health practice in the fields of health systems and community- and technology-informed approaches to improving maternal, neonatal and child health, with work experience in the U.S., Philippines, Kenya and Tanzania. Her focus is to test new platforms to scale up vaccine access, to determine best practices for scaling up vaccine access in unstable health systems, to make the economic case with and for countries to invest in preventive medicine strategies such as equitable, sustainable vaccine access programs, and to define methodological, research-based frameworks for community-based health systems strengthening interventions, focused on maternal, neonatal and child health. 

Chief Resident 


Ryan D. Lang, MD, MPH serves on faculty in the Department of Health Policy and Management and is Chief Resident of the General Preventive Medicine Residency Program. Lang received his Bachelor of Science degree in Biochemistry from Oakwood University in Huntsville, Alabama, where he graduated summa cum laude. During his time as an undergraduate, he became heavily involved in scientific research and was one of 16 students in the nation to be awarded a UNCF-Merck Undergraduate Science Research Scholarship in 2008. However, his desire to serve in the community inspired him to pursue a career in medicine.
He earned his medical degree at Vanderbilt University School of Medicine in Nashville, Tennessee and worked with fellow classmates to revive a student interest group in preventive medicine while there. During both his undergraduate and medical school years, he also developed an extensive global health background and worked on projects in Jordan, Kenya, and South Africa. After graduating from medical school, Lang completed internal medicine residency with special concentrations in urban health and primary care at the Johns Hopkins Hospital. He then completed a second residency in preventive medicine at the Johns Hopkins Bloomberg School of Public Health, where he also received his Master of Public Health degree.

During his time as a preventive medicine resident, Lang worked with co-residents and community members to facilitate weekly community culinary workshops and to support nutrition education within a local neighborhood in Baltimore. His involvement was highlighted in The Maryland Reporter and Johns Hopkins Medicine Dome newsletter.

In 2011, he was one of 10 individuals to receive a Future Leaders in Preventive Medicine grant from the American College of Preventive Medicine (ACPM) and attended his first ACPM conference as a medical student. Lang was also one of 15 young Marylanders (and the only physician) selected to participate in the 2017 New Economy Maryland Fellowship Program from the Institute for Policy Studies, which provides training for individuals to advocate for a more equitable economy in Maryland. He has a strong interest in health communications and has written several editorials and letters to the editor which have been published in periodicals such as The Washington Post, The Baltimore Sun, The Maryland Reporter, Johns Hopkins Medicine Biomedical Odyssey, and Hopkins Medicine Magazine. He also completed a brief internship with the Medical Unit at ABC News in New York City.

He plans to work with programs focused on chronic disease prevention and health communication in urban communities.