Originally from Miami, FL, Marshall earned a B.S. in Math and Economics from Georgetown University. He has been teaching math at Greenwich Country Day School since 2003 and currently serves as the Assistant Head of the Middle School. He completed his Master’s degree in Math Leadership from Bank Street College in 2011.

Marshall has been working with Carnegie Prep since 2004 as an SAT Math and ACT Math/Science classroom teacher.

He lives in Greenwich with his wife and children.