Calvert, founder of the Maryland Agricultural College, President of the Board of Trustees, and well-known philanthropist, planter and congressman, served as acting president following Hallowell's resignation.

Enrollment increased under his brief administration, from 35 to 68 students. He established a non-credit preparatory program for applicants who could not meet the College's academic requirements. He also hired a prominent Washington scientist, Townsend Glover, as professor of botany and entomology.

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