Born on August 26, 1769, in Elkton, Province of Maryland, British America, Glenn entered private practice in Baltimore, Maryland.

He was United States Attorney for the District of Maryland from 1812 to 1824.

[1] Glenn received a recess appointment from President James Monroe on August 31, 1824, to a seat on the United States District Court for the District of Maryland vacated by Judge Theodorick Bland.

He was confirmed by the United States Senate on January 3, 1825, and received his commission the same day.

[1] Following his resignation from the federal bench, Glenn resumed private practice in Baltimore from 1836 to 1846.