Faculty and Staff Directory | Gilman School

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Mariellen Kemp Costabile

Title: Human Resources Associate

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5407 Roland Avenue Baltimore, MD 21210

410-323-3800 (main)

410-323-7030 (security)

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Gilman is the #1 All-Boys High School in Baltimore in 2026

Founded in 1897, Gilman School is a
pre-kindergarten through twelfth grade independent school located in Baltimore, Maryland. A diverse community dedicated to educating boys in mind, body, and spirit, Gilman seeks to produce men of character and integrity who have the skills and ability to make a positive contribution to the communities in which they live and work.

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