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School Leaders

Roxbury Prep Mission Hill Campus Leaders

Sarah Hempleman
Ms. Hempleman started her career teaching 7th and 8th grade at Harlem Academy, a New York City middle school. During this time, she studied at New York University where she received her master's in education. Sarah joined Uncommon in 2013 at Roxbury Prep Dorchester Campus as a 5th grade reading teacher.  Since then, she has served in a variety of roles including Dean of Curriculum and Instruction, 5th-8th ELA Teacher, Instructional Leader, and Instructional Fellow.

Rhett Smith
Director of Operations
Before joining RPC as the Director of Operations, Mr. Smith was a program director at a summer camp with the YMCA in Raleigh, NC. He also brings experience as an analyst in the financial sector. Mr. Smith holds a B.A. in Economics from Sewanee University of the South and an M.B.A from Georgetown University.



Roxbury Prep Lucy Stone Campus Leaders

Val Joell

Ms. Joell is from Philadelphia, PA.  Before joining Uncommon Schools, she was a founding Dean of Curriculum and Instruction at UP Academy Kennedy in Springfield, MA. Prior to that, she taught 7th grade math at UP Academy Boston. In her free time, she loves going to ballet and modern dance classes, reading, and dabbling in running. Ms. Joell graduated from the University of Pennsylvania with degrees in Urban Studies and Africana Studies, and earned her masters in effective teaching from the Sposato Graduate School of Education. Ms. Joell is passionate about creating joyful, rigorous learning environments in which all children, regardless of background, develop their identifies as deep thinkers and powerful problem solvers who achieve at high levels on the pathway to college and beyond.


Kim Kinsman
Director of Operations



Roxbury Prep Dorchester Campus Leaders

Dan Cosgrove
Before coming to Roxbury Prep, Mr. Cosgrove was a teacher and instructional coach at Uncommon Schools Leadership Prep Bedford Stuyvesant in Brooklyn. He joined LPBS as a Teach for America corps member and taught grades 3-4 before becoming an instructional coach for science and history teachers. He then became Dean of Students for LPBS’ Middle Academy. Mr. Cosgrove earned a B.A. from Trinity College, a Master’s in Education from the  Relay Graduate School of Education, and completed the Relay GSE National Principals’ Fellowship.



Majken Fisselier
Director of Operations

Before joining Roxbury Prep, Majken worked in education for the Metropolitan Museum of Art and the Brooklyn Botanic Garden. She has worked at Roxbury Prep Dorchester as an Office Manger, Director of Operations, Operations Fellow and now as the Director of Operations. She is dedicated to closing the achievement gap for students in Boston. Majken holds a B.A. in French Language and Literature and Art History from Boston University and an M.A. in Museum Studies from New York University.


Roxbury Prep High School Campus Leaders

Shradha M. Patel
Ms. Patel previously served as Principal and Dean of Curriculum and Instruction at Roxbury Prep Lucy Stone. Prior to joining RPHS, she was the Middle Academy Director at Uncommon Schools Excellence Boys Charter School in Brooklyn. Before leading Excellence Boys, she served as the 8th Grade History Teacher, Enrichment Coordinator, and Graduate Services Coordinator for six years at Roxbury Prep’s Mission Hill campus. Ms. Patel holds a B.S. in Education from Brown University and an M.A. in History from Tufts University.

Eliza Jackson
Co-Director of Operations
Before joining Roxbury Prep, Ms. Jackson spent time working in Financial Services at Bloomberg in NYC. Almost six years ago, she transitioned to LPOH (an Uncommon Elementary School) in Brooklyn to teach 4th grade. After moving to Boston, she worked as the Director of Special Projects of RPHS before transitioning into the Director of Operations role at RPHS. She is a graduate of Connecticut College with a BA in English and of Columbia University Teachers College with an MA in Curriculum Development and Teaching.

LOWER SCHOOL CAMPUS (9th and 10th)









UPPER SCHOOL CAMPUS  (11th and 12th)


Elizabeth Boyar

Director of Operations


Kris Elbein








Chris Reed

Director of Operations


Titciana Barros