Our Faculty
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![Ahmed Shelbaya, MD Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=Eqrec484 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=ozZoeIrw 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=SUdQzj7o 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=_XlDWSRC 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=LPxpfhKJ 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=bl-IvBqy 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/b6cbd9b0-7b01-11ed-bf65-b1a6006850f8.jpeg?itok=fquD22RJ 800w)
Departments/Divisions
Department of Epidemiology
Academic Appointments
- Lecturer in Epidemiology
![Rachel Shelton, ScD, MPH Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=xVc5ySIm 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=lSwdJcP7 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=TyRsKvkR 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=PxC_pmfF 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=swQK97E6 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=B1OJ9F0X 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/9908ca80-bb63-11ed-8a63-173bdddc6662.jpg?itok=28oncWjq 800w)
Departments/Divisions
Department of Sociomedical Sciences
Research Interests
Chronic disease, Community Health, Urban Health
Academic Appointments
- Professor of Sociomedical Sciences
![Peggy Shepard Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=zwttQqdL 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=vdTxxkLP 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=lwYMJsJR 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=KZLj0176 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=HtumAEJJ 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=lDF8nHLt 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/fd6a8e40-becf-11ed-9883-5dcef451790f.jpg?itok=Kr01eqjU 800w)
Departments/Divisions
Department of Environmental Health Sciences
Academic Appointments
- Lecturer of Environmental Health Sciences
![](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/default_images/default-headshot-cumc-crown.png?itok=kNzPiu6- 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/default_images/default-headshot-cumc-crown.png?itok=LoHBhOpT 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/default_images/default-headshot-cumc-crown.png?itok=CxKBn_PF 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/default_images/default-headshot-cumc-crown.png?itok=K4WWhXZa 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/default_images/default-headshot-cumc-crown.png?itok=nkhBsI0D 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/default_images/default-headshot-cumc-crown.png?itok=F3uNDQa4 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/default_images/default-headshot-cumc-crown.png?itok=GFwRChqM 800w)
Departments/Divisions
Department of Health Policy and Management
Academic Appointments
- Senior Lecturer of Health Policy and Management
![Rupak Shivakoti, PhD, MHS Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=bJ-oZv1Q 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=xaP5yCr- 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=7BWjEWL- 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=5f2tBy4W 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=Ao5Snp03 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=3bqnFiog 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/3b201ec0-becc-11ed-bec5-931a3e52a5eb.jpg?itok=u7jCwpWI 800w)
Departments/Divisions
Department of Epidemiology
Research Interests
Child and Adolescent Health, Environmental Health, Food Policy and Obesity, Global Health, HIV/AIDS, Infectious Diseases, Maternal and Reproductive Health
Academic Appointments
- Assistant Professor of Epidemiology
![](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/default_images/default-headshot-cumc-crown.png?itok=kNzPiu6- 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/default_images/default-headshot-cumc-crown.png?itok=LoHBhOpT 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/default_images/default-headshot-cumc-crown.png?itok=CxKBn_PF 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/default_images/default-headshot-cumc-crown.png?itok=K4WWhXZa 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/default_images/default-headshot-cumc-crown.png?itok=nkhBsI0D 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/default_images/default-headshot-cumc-crown.png?itok=F3uNDQa4 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/default_images/default-headshot-cumc-crown.png?itok=GFwRChqM 800w)
Departments/Divisions
Department of Health Policy and Management
Academic Appointments
- Adjunct Assistant Professor of Health Policy and Management
![Karolynn Siegel, PhD Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=gfOQIETj 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=do5Qjz22 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=2pSH7jHw 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=MkdQP1C0 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=mqOj0q2s 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=FHSeXNMW 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/81503150-bcf1-11ed-81b6-1b1dc2683169.jpg?itok=URcckD9J 800w)
Departments/Divisions
Department of Sociomedical Sciences
Research Interests
Chronic disease, Community Health, HIV/AIDS, Mental Health, Substance Use
Academic Appointments
- Professor of Sociomedical Sciences and Social Work
![Kathleen Sikkema, PhD Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=7n1aKmNu 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=_Xwg86_C 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=JMZz54Co 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=2rGCYz5e 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=46diTdbL 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=KWGtHn6o 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/04e03af0-bd2f-11ed-938e-bdcda9acdcb8.jpeg?itok=AomRJuO6 800w)
Departments/Divisions
Department of Sociomedical Sciences
Research Interests
Biostatistical Methods, Community Health, Global Health, HIV/AIDS, Maternal and Reproductive Health, Mental Health
Academic Appointments
- Chair, Department of Sociomedical Sciences
- Stephen Smith Professor, Sociomedical Sciences
![Francoise Simon, PhD Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=J3K195b_ 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=7QXxmE5B 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=3fKkztuW 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=uevACMkN 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=it2fWNNN 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=2LAVAAkp 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/5a37e7c0-71a1-11ed-96cd-bfd400418fb5.jpg?itok=TCt3A6Z1 800w)
Departments/Divisions
Department of Health Policy and Management
Academic Appointments
- Clinical Professor Emerita of Health Policy and Management
- Senior Lecturer, Health Policy and Management
- Senior Lecturer, Business School
![Randolph Reyes Singh, PhD Profile Headshot](https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_200/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=SwC6AjzI 200w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_260/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=_wO0MkTj 260w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_320/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=Z_GxqofL 320w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_400/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=VdyxwVA1 400w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_520/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=a_AJXwZm 520w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_640/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=D1RmfppT 640w, https://www.publichealth.columbia.edu/sites/default/files/styles/cola_media_800/public/cups-profile/headshot/24e8a6f0-63a3-11ee-bd4e-3d8872337956.jpg?itok=w9Za98XJ 800w)
Departments/Divisions
Department of Environmental Health Sciences
Research Interests
Chemical Exposome, Environmental Epidemiology, Environmental Health, HRMS-based Nontarget Analysis
Academic Appointments
- Assistant Professor of Environmental Health Sciences