Our Partners

Director, Mines to Markets (M2M), Pact

Cristina is the longtime director of the M2M program at Pact and she is a co-founder of Moyo Gems. She is a recognized global expert in ASM, has nearly 20 years of experience in the international development sector, and is a popular speaker on responsible mining and jewelry themes. She is an advisory council member of the Gemstone Knowledge Hub and Ethical Metalsmiths, among others, and is on the board of the Jewelry Industry Summit. Cristina is a graduate of UC San Diego, the London School of Economics, and lectures at the Columbia University’s massive open online course (MOOC) and Executive Courses focused on extractives. Prior to joining Pact in 2014, she focused on diamonds and gold at specialist consulting firms in the US & UK, worked with WWF, the Fund for Global Human Rights, and the World Bank. Originally from Northern California, she has lived and worked for extended periods in London, UK, Kampala, Uganda, and Washington, DC.  She is on Instagram at cristina.rocks and pact.rocks 

Deputy Regional Director, Africa

Marianna is a Tanzanian health leader with 20 years of experience in health, governance, stakeholder engagement and advocacy, strategic management, and public-private partnership management.  Prior to Pact, Marianna was Tanzania country director at Palladium, a health policy advisor at the Embassy of Switzerland in Tanzania, and provided technical assistance to programs in Rwanda, Kenya, Ghana and South Africa. She has served on the boards of several Tanzanian indigenous organizations and is currently a Principal Investigator in a randomized trial evaluating incentives to prevent HIV and sexually transmitted infections in Tanzania. Marianna joined Pact in 2019 as Country Director for Pact Tanzania, one of Pact's largest and most dynamic offices. In 2022, she now oversees the management and operations of Pact’s 14 country offices in Africa. 

Moyo Gems Market Day Manager and Administration Officer, Pact Tanzania

Sosthenes is the Administration Officer at Pact Tanzania responsible for facilities/properties, logistics management, safety, security and support services. Prior joining Pact, he was a Manager, Corporate Support Service Desk at NMB Bank Plc, where he was responsible for coordinating and managing supply chain service level agreements (SLAs) on non-ICT related issues. Sosthenes has a combined 5 years of experience in Supply Chain SLA Management, Procurement, Asset and Properties Management. He is a certified procurement and supply chain professional (CPSP) by Procurement and Supplies Professional and Technicians Board (PSPTB) of Tanzania and International Federation of Purchasing and Supply Management (IFPSM), holds MBA in Logistics Management from Coventry University and Bachelor Degree in Procurement and Logistics Management from the Institute of Accountancy Arusha.

Sosthenes provides logistics support to Moyo programs, and acts as a local partners’ liaison personnel. He is a key person in supporting market day activities specifically in logistics arrangement, translations and recording transactional data in the market.

Director of Research, Pact Tanzania

Amon Exavery is the Research & Learning Coordinator for Pact’s USAID Kizazi Kipya Project in Tanzania. He is an active biostatistician with nearly 10 years of experience in quantitative and qualitative data analysis, health research, and program monitoring and evaluation in Tanzania. He has worked extensively in the areas of reproductive, maternal, newborn, and child health, adolescent reproductive health, and HIV/AIDS. Amon is our measurement man on the ground, and has already conducted a baseline evaluation for the gemstone pilot program in two districts in Tanzania. He holds an MSc. degree in Population–based Field Epidemiology from the University of the Witwatersrand, Johannesburg, and a bachelor’s degree in Statistics from the University of Dar es Salaam in Tanzania. He has authored over 12 research papers, and co–authored over 20 others in national and international journals.

Program Ops, Moyo Gems

Kelly leads program management for Moyo Gems within her role on the  the East & West Africa portfolio at Pact. Before Pact, she worked with Save the Children, the UN Foundation, United Way, School of St. Jude (Arusha, Tanzania), and she has a Masters from the London School of Economics and a BA from Clemson University.