[2] He thereafter attended Washington Academy of Somerset County, Maryland, and graduated from Yale College in 1803.
He studied law, was admitted to the bar, and commenced practice.
[1] In 1810; 1815 and 1816; and again from 1819 to 1821, Dennis served as a member of the Maryland House of Delegates.
[2] Dennis was elected as an Anti-Jacksonian to the United States House of Representatives in 1832 and served from March 4, 1833, until his death in office in 1834.
[2] He died April 14, 1834, while in Washington, D.C. and was interred in the Congressional Cemetery there.