Our Team

Dr Branwen J Hennig

Executive Director at GHPL
Virchow Foundation & Charité Center for Global Health (CCGH), Berlin, Germany.

Caleb Kumar

Data Scientist
Health Systems Innovation Lab (HSIL) Harvard T.H. Chan School of Public Health, Boston, USA

Dr. Michael Bayerlein

Health Policy Scientist
Charité Center for Global Health (CCGH), Berlin, Germany.

Branwen leads the GHPL initiative, overseeing the Berlin-based team and global partnerships. She champions a co-development approach, uniting cross-sector stakeholders and experts in global health, policy, and technology. She previously held on developing and delivering strategic priorities and overseeing large international programmes in global health as funder, consultant and researcher. She previously held senior positions at Wellcome Trust, Medical Research Council Unit The Gambia, London School of Hygiene & Tropical Medicine (LSHTM), and consulted for WHO and beyond. She holds a PhD in genetic epidemiology from the University of Newcastle upon Tyne, and a Diploma in Epidemiology from LSHTM.

Caleb is a Data Scientist with the Health Systems Innovation Lab at the Harvard T.H. Chan School of Public Health. He develops artificial intelligence tools to support public health policy analysis. Before joining Harvard, Caleb worked on generative AI models at Medtronic and co-founded several digital health applications, including iRecover for brain injury rehabilitation, IndexoRx to address pharmacy challenges, and Jaid to enhance EHR interoperability. While a student at Stanford University, Caleb patented a machine learning technology and founded a company that won the University World Startup Cup in 2015, later acquired in 2021. He also led Stanford’s cyber defence team and conducted research on improving opiate-related patient–provider communications. Caleb holds an MSc from Stanford University.

Michael is a health policy scientist at GHPL. He focuses on advancing research in health policy, medical supply chains, populism, and political economy, with a strong emphasis on quantitative methods. Before joining GHPL, Michael worked as a policy advisor and researcher at the German Institute for International and Security Affairs (SWP) within the EU/Europe research group. He was also a fellow at the Kiel Institute for the World Economy. Michael holds a PhD from the Faculty of Business, Economics, and Social Sciences at Kiel University. He also earned an MA in international politics and international law from Kiel University and a BA in political science from the University of Mannheim.

Rebecca Ohanes

Communications & Partnerships Manager at
GHPL & Virchow Foundation Berlin, Germany.

Hendrik Oye

Project Manager
Charité Center for Global Health (CCGH), Berlin, Germany

Rebecca is the Communications & Partnerships Manager at GHPL, where she leads communications and engagement strategies to drive visibility and support for global health policy initiatives. Prior to joining GHPL, Rebecca held several communications and development roles. Most recently, she worked at the TUMO Center for Creative Technologies, where she developed multi-channel campaigns highlighting non-formal education initiatives. Rebecca holds an MA in Political Science from Goethe University in Frankfurt am Main, Germany.

Hendrik is Project Manager at GHPL, where he focuses on stakeholder engagement, partnerships, and event coordination to support applied research and initiatives that strengthen equitable access to health policymaking at global and national levels. Prior to joining GHPL, Hendrik held multiple roles at the Global Fund to Fight AIDS, Tuberculosis and Malaria in Geneva. Most recently, he served as Operations Officer for the Technical Review Panel Secretariat, overseeing multi-stakeholder funding reviews, budgeting, and strategic partner engagement. He also brings experience in international development from roles at GIZ in West Africa and Germany, and as co-founder of a social enterprise in the Netherlands focused on sustainable food systems. Hendrik holds an MSc in African Studies from the University of Oxford and a BA in International Studies from Leiden University.

Our Team

Dr Branwen J Hennig

Executive Director at GHPL
Virchow Foundation & Charité Center for Global Health (CCGH), Berlin, Germany.

Branwen leads the GHPL initiative, overseeing the Berlin-based team and global partnerships. She champions a co-development approach, uniting cross-sector stakeholders and experts in global health, policy, and technology. She previously held on developing and delivering strategic priorities and overseeing large international programmes in global health as funder, consultant and researcher. She previously held senior positions at Wellcome Trust, Medical Research Council Unit The Gambia, London School of Hygiene & Tropical Medicine (LSHTM), and consulted for WHO and beyond. She holds a PhD in genetic epidemiology from the University of Newcastle upon Tyne, and a Diploma in Epidemiology from LSHTM.

Caleb Kumar

Data Scientist
Health Systems Innovation Lab (HSIL) Harvard T.H. Chan School of Public Health, Boston, USA

Caleb is a Data Scientist with the Health Systems Innovation Lab at the Harvard T.H. Chan School of Public Health. He develops artificial intelligence tools to support public health policy analysis. Before joining Harvard, Caleb worked on generative AI models at Medtronic and co-founded several digital health applications, including iRecover for brain injury rehabilitation, IndexoRx to address pharmacy challenges, and Jaid to enhance EHR interoperability. While a student at Stanford University, Caleb patented a machine learning technology and founded a company that won the University World Startup Cup in 2015, later acquired in 2021. He also led Stanford’s cyber defence team and conducted research on improving opiate-related patient–provider communications. Caleb holds an MSc from Stanford University.

Dr. Michael Bayerlein

Health Policy Scientist
Charité Center for Global Health (CCGH), Berlin, Germany.

Michael is a health policy scientist at GHPL. He focuses on advancing research in health policy, medical supply chains, populism, and political economy, with a strong emphasis on quantitative methods. Before joining GHPL, Michael worked as a policy advisor and researcher at the German Institute for International and Security Affairs (SWP) within the EU/Europe research group. He was also a fellow at the Kiel Institute for the World Economy. Michael holds a PhD from the Faculty of Business, Economics, and Social Sciences at Kiel University. He also earned an MA in international politics and international law from Kiel University and a BA in political science from the University of Mannheim.

Rebecca Ohanes

Communications & Partnerships Manager at
GHPL & Virchow Foundation Berlin, Germany.

Rebecca is the Communications & Partnerships Manager at GHPL, where she leads communications and engagement strategies to drive visibility and support for global health policy initiatives. Prior to joining GHPL, Rebecca held several communications and development roles. Most recently, she worked at the TUMO Center for Creative Technologies, where she developed multi-channel campaigns highlighting non-formal education initiatives. Rebecca holds an MA in Political Science from Goethe University in Frankfurt am Main, Germany.

Hendrik Oye

Project Manager
Charité Center for Global Health (CCGH), Berlin, Germany

Hendrik is Project Manager at GHPL, where he focuses on stakeholder engagement, partnerships, and event coordination to support applied research and initiatives that strengthen equitable access to health policymaking at global and national levels. Prior to joining GHPL, Hendrik held multiple roles at the Global Fund to Fight AIDS, Tuberculosis and Malaria in Geneva. Most recently, he served as Operations Officer for the Technical Review Panel Secretariat, overseeing multi-stakeholder funding reviews, budgeting, and strategic partner engagement. He also brings experience in international development from roles at GIZ in West Africa and Germany, and as co-founder of a social enterprise in the Netherlands focused on sustainable food systems. Hendrik holds an MSc in African Studies from the University of Oxford and a BA in International Studies from Leiden University.