Senior Leadership Team


Leslie-Bernard Joseph
Chief Executive Officer
Leslie-Bernard Joseph returns to Coney Island Prep as its Chief Executive Officer. He works to lead all schools and the central office team, ensuring that CIP continues to deliver on its ambitious mission and commitment to our scholars, family, and community.
Born in Brooklyn and raised in Queens, Leslie attended New York City public schools through eighth grade before receiving a scholarship to attend boarding school in Massachusetts through Prep for Prep.
He received his bachelor’s degree in Politics and African-American Studies from Princeton, where he served as both student body and Black Student Union president. He holds a law degree, with distinction, from Stanford Law School and a master’s degree from Stanford Graduate School of Education. While at Stanford, Leslie was a 2013 Paul and Daisy Soros Fellow.
Leslie has worked as an associate at the law firm, Skadden Arps; as an associate at the management consulting firm, McKinsey & Company; and as a managing director at the Harlem Children’s Zone where he led a portfolio of 8 programs serving approximately 4,400 students across HCZ’s K-12 pipeline. He is also a former trustee of Prep for Prep.
He began his career teaching fifth grade in the Bronx through Teach For America, before joining the founding team at Coney Island Prep as the school’s first Dean of Students in 2009. He is excited and proud to return to CIP!
Leslie-Bernard Joseph
Chief Executive Officer


Karen Johnson
Chief Operating Officer
Karen Johnson is the Chief Operating Officer of Coney Island Prep and former founding Director of Operations of CIP’s Upper Elementary School. The importance of a good education was instilled in Karen from a very young age, but it wasn’t until college that she realized that she wanted to be an educator. She believes that all students deserve access to a quality education, and works to ensure Coney Island Prep continues to deliver on its mission.
Prior to joining Coney Island Prep, Karen was a Teach for America New York City Corps Member, taught middle school science at Uncommon Schools, and worked on the network team at Success Academies. She later joined CIP as an Academic Operations Manager, before leading operations teams across two campuses as a Director of Operations.
She holds an undergraduate degree from Harvard College, and a Masters in Teaching from the Relay Graduate School of Education.
Karen Johnson
Chief Operating Officer


Rachel Kashner
Chief Schools Officer
Rachel is the Chief Schools Officer and former founding principal of Coney Island Prep’s Upper Elementary School. After completing her undergraduate degree in Elementary Education from the College of Charleston, she spent seven years as a teacher and instructional leader in Newark, NJ before joining the CIP community. Beginning as the Director of Curriculum and Instruction in 2016, she went on to lead the Upper Elementary School in 2019. She also holds a master’s degree in Educational Leadership from Montclair State University.
Rachel believes deeply that education is the driver of change and wants to ensure that every CIP student has amazing opportunities to set them up for success in college and beyond. She is excited to be in this role where she can combine her love of working with children and adults to help CIP fulfill its mission. As a leader, she believes in setting the bar high and doing whatever it takes to ensure that every student is able to meet and exceed it. In her free time, she loves to spend time with her family, try new restaurants, and be outside in the warm weather.
Rachel Kashner
Chief Schools Officer

Marcia Herrera
Chief Financial Officer


Liza Potter
Chief Academic Officer
Liza Potter is Coney Island Prep’s Chief Academic Officer. Most recently before joining the CIP team, Liza served as Head of Schools at KIPP New Jersey, where she managed a portfolio of middle and high schools in Newark and Camden, and as Deputy Chief Academic Officer at Mastery Charter Schools in Philadelphia. At Mastery, Liza led the network’s vision and strategy for K-12 English language arts, social studies, world languages, ELL/bilingual education, and the arts, and spearheaded a comprehensive redesign of the network’s early literacy program to align with the science of reading.
Liza began her twenty-year public education career as a high school English and writing teacher in North Carolina before relocating to Brooklyn, where she had the privilege to serve on the founding leadership teams of the Urban Assembly School for Law and Justice and the Urban Assembly School for Green Careers. Liza holds a M.Ed. from Bank Street College of Education, where she earned school district leader certification in both New York and New Jersey, and both an MAT in Secondary English Education and a BA in English from the University of North Carolina at Chapel Hill.
Liza Potter
Chief Academic Officer


Ashley Weech
Chief Strategy Officer
Ashley is the Chief Strategy Officer, and was the founding Director of Operations at CIPES. She is a graduate of the University of Michigan and a proud Wolverine. She began her career at MDRC, a non-profit research organization, where she was a project manager for large studies of social and educational programs aimed at alleviating poverty. Her favorite part of her work was visiting New York City public schools, where she interacted with teachers and students. Seeing educational disparities up close and through data prompted her interest in joining the charter school movement.
At Coney Island Prep, she feels grateful every day to come to a place full of teachers, families, and students who are all working together towards the same mission of college access and career choice for the community of Coney Island. In her free time, Ashley enjoys cooking delicious meals for friends and family, and traveling internationally.
Ashley Weech
Chief Strategy Officer
School Leaders

Christy Frembes Boise
Principal, Coney Island Prep High School

Ladeidra McCullough
Interim Principal, Coney Island Prep Middle School

Crystal Dewar
Principal, Coney Island Prep Upper Elementary School

Brittany Harper
Principal, Coney Island Prep Lower Elementary School

Claudia Aubourg
Director of Operations, Coney Island Prep High School

Yemisi Nassirou
Director Of Operations, Coney Island Prep Middle School

Kevin Pesantez
Director of Operations, Coney Island Prep Upper Elementary School

Erin Swide
Director Of Operations, Coney Island Prep Lower Elementary School