Staff

Saira George-Carbello

Senior Manager for Product Introduction & Access, and Long-Acting PrEP Coalition

Saira is a Senior Program Manager at Health Market Access Bridge, where she leads the Secretariat for the new Coalition to Accelerate Access to Long-Acting PrEP, which is convened by Unitaid, WHO, UNAIDS, The Global Fund, and PEPFAR. In this role, Saira works to foster productive relationships across the Coalition's stakeholders and collaborates to identify sleek approaches to optimizing access to new, long-acting PrEP options.

She brings significant experience in coalition-building, market-shaping and stakeholder management in the global health field.

Previously, Saira was Senior Strategy Manager at CEPI (the Coalition for Epidemic Preparedness Innovations), where she played a lead role in governance both at CEPI and at the COVAX Strategic Coordination Office, the central team that coordinated strategy, governance, and operations globally during the Covid-19 pandemic. Prior to CEPI, Saira was on the Global Markets Team at CHAI (Clinton Health Access Initiative), where she scoped market-shaping deals to improve access to global health commodities. She started her career in strategy consulting advising multinational pharmaceutical and biotech companies.

Saira has an MSc from London Business School and a BSc from the London School of Economics.

Tasha Mwila

Program Coordinator

Tasha is the Program Coordinator at Health Market Access Bridge, where she provides coordination and administrative support across all Product Introduction and Access projects. She supports the work of the Dual Prevention Pill (DPP) Consortium and the Coalition to Accelerate Access to Long-Acting PrEP. She is primarily responsible for coordinating meetings and events; tracking, synthesizing, and disseminating information on the DPP and long-acting PrEP; supporting donor reporting; and contributing to project deliverables. Tasha brings rich product introduction and advocacy experience to this role.

Previously, she served in a similar role at AVAC and, before that, as an Advocacy, Information, and Research Officer in the AVAC Advocacy Fellows Program. In that role, she led a project advocating for the introduction of the Dapivirine Vaginal Ring and Cabotegravir Injectable PrEP in Zambia. She successfully met all project objectives, contributing to both products being approved and included in the national HIV prevention guidelines as prevention options. She has also contributed as a Global Alliance Champion and served as a member of the HIV Testing Services (HTS) Community Advisory Board with the Clinton Health Access Initiative (CHAI).

Tasha is a 2025 Global Health Corps African Leadership Accelerator Fellow, an IVLP 2024 alumna, and an AVAC 2022 alumna. She holds an MSc in Analytical Epidemiology and a BA in Economics, Marketing, and Psychology.

Wawira Nyagah

Executive Director

Wawira Nyagah is the Executive Director of Health Market Access Bridge, where she leads the organization’s mission to accelerate equitable, sustainable access to HIV prevention and SRH innovations across low- and middle-income countries. She brings nearly 2 decades of experience working at the intersection of public health, policy, health markets and community-driven delivery to ensure health products reach the people who need them most.

Before joining Health Market Access Bridge, Wawira served as Director of Product Introduction and Access at AVAC, spearheading global and country-led efforts to move promising HIV prevention technologies (DVR, CAB, and LEN) from evidence to impact. Earlier, she worked for more than a decade with PS Kenya in various roles, including as Director of Strategy & Innovations, and helped reimagine how health programs are designed and delivered—integrating behavioral insight, strategic communications, and service delivery to achieve scale and sustainability.

Wawira has worked extensively with global and regional organizations and has collaborated with governments, donors, normative agencies, product developers, and civil society to overcome structural barriers to access, from regulatory and financing constraints to market readiness and last-mile delivery. Her work has contributed to shaping policies, strengthening health systems, and advancing integrated product introduction, access and uptake across HIV prevention, family planning, maternal, newborn and child health, and adolescent sexual and reproductive health.

Wawira holds a Master's degree in Social Communications and a Bachelor's degree in Social Sciences from the Gregorian Pontifical University in Italy.

Catherine Verde-Hashim

Program Manager

Cat is a Program Manager at Health Market Access Bridge where she leads the tracking, compilation, analyses, and dissemination of evidence, gaps, and lessons from PrEP research and implementation and manages PrEPWatch.org, the go-to source of information to help the global community deliver PrEP.

Previously, Cat worked for MSI Reproductive Choices for over a decade in a variety of roles, including as Global Channel Manager, where she provided leadership, operational direction, and direct technical support to three channels delivering high quality sexual and reproductive health services across 26 countries in Africa and Asia.

Cat holds a BA from McGill University, with a major in International Development Studies and double minor in Latin American Literature and Middle Eastern Languages, and an MSc from the University of Edinburgh with a concentration in Global Health.

Kate Segal

Senior Advisor

Kate is Senior Advisor to Health Market Access Bridge while working at AVAC in support of the Dual Prevention Pill (DPP) Consortium, a coalition of organizations working to bring the DPP to market. In this role, Kate coordinates and tracks activities across project partners and disseminates the latest project developments. More broadly, she contributes to new biomedical HIV prevention introduction plans and global conversations on HIV/SRH integration and other cross-cutting issues. Since joining AVAC, Kate has supported the development and execution of an initial Market Preparation and Introduction Strategy for the DPP, partnerships to advance HIV/SRH integration, and human-centered design research to inform demand generation for prevention.

Kate joined AVAC in 2018, bringing years of project management, policy, and qualitative research experience from the human rights and SRHR fields.

Prior to joining AVAC, Kate was the Sexual and Reproductive Health and Rights (SRHR) Policy Analyst and Global Health Corps Fellow at the Center for Health and Gender Equity (CHANGE), where she coauthored the report Prescribing Chaos in Global Health: The Global Gag Rule from 1984-2018. Kate has also worked with the Women's Rights Division and Americas Division at Human Rights Watch, and with the Global Legal Program at the Center for Reproductive Rights.

She has an MA from The New School and a BA from Tulane University.