Interested in joining our team? We’re hiring a Head of Engagement and a Software Engineer. We’d love to hear from you!




Jamie Poskin, Founder & Executive Director

Jamie is a former high school math and English teacher, coach, and athletic director with an MA in Education and MBA from Stanford. He also spent seven years working as an experimental theater artist with The Wooster Group and as the director of his own company.


Berk Coker, Founder & CTO

Berk holds a BS and MS in Computer Science from Stanford with a focus in machine learning. He has served as a Teaching Assistant for Stanford’s advanced level natural language processing courses, working with folks like Dan Jurafsky. Before TeachFX, he was involved in the No Lost Generation Initiative at the Bureau of Population, Refugees, and Migration (U.S. Department of State).


Nicole Hemenway Bratz, Head of Product

Nicole is a full stack engineer with a BA in languages and literatures from UC Berkeley. Since graduating and before starting at TeachFX, she has been a language fellow in India and in Pakistan, she has spent a year working with a women’s legal advocacy organization in India researching law and policy related to forced marriages and domestic violence, and she was Co-Field Director of the Campaign to Recall Judge Persky.


David Brazer, Director of Professional Learning

Prior to joining TeachFX, David was a Professor and Director of Leadership Degree Programs at the Stanford University’s Graduate School of Education. His research and writing focus on the challenges of school and district leadership, exploring how those challenges are met in practice. His third book (with Scott Bauer and Bob L. Johnson, Jr.), Leading Schools to Learn, Grow, and Thrive: Using Theory to Strengthen Practice will be published by Routledge in 2019. Previously, David spent 15 years in K-12 education as a teacher and high school administrator. [CV]


Zach Crago, Head of Partnerships

Zach Crago has an MBA from the Stanford Graduate School of Business with a certificate in public management. After graduating from business school, he worked as a consultant at The Bridgespan Group, a global leader in nonprofit consulting. Zach is from South Dakota, where he advocated for educators running for elected office to better support local schools, teachers, and kids.


Caryn Tran, Lead Software Ninjaneer

Caryn has a Master's in Electrical Engineering and Computer Science from UC Berkeley with a primary focus in Artificial Intelligence and a secondary focus in Education. Throughout undergraduate and graduate years, Caryn assisted several computer science courses and taught as a volunteer for programs such as Girls Who Code and Be A Scientist. Her research is on AI applications in Wireless Radios; she is on the Apache Cordova PMC and is an OpenMined contributor.




Dora Demszky, Data Science & Linguistics Fellow

Dora is a PhD student in Linguistics at Stanford University. Her primary interest is using large-scale, data-driven approaches to inform linguistic theory, with particular focus on semantics, cognitive linguistics, and sociolinguistics. She has a BA from Princeton University in Linguistics and Computer Science.




Jennifer Carolan

Co-Founder & General Partner, Reach Capital


Russell Siegelman

Angel Investor; Board Chair, Global Innovation Fund; Lecturer, Stanford Graduate School of Business