 He attended private school, studied law under James M. Buchanan, and was admitted to the bar around 1837.LeGrand served as a member of the Maryland House of Delegates from 1839 to 1841, including a period as Speaker in 1841.He later served as Secretary of State of Maryland from 1842 to 1844, and wrote a book, "Oration on the Landing of the Pilgrims of Maryland" which was published in May 1843.