He did a tour in Vietnam, from 1966 until 1967, and served as Deputy Branch Chief for the National Security Agency from 1968 to 1970.

He has had the honor of serving as an alternate delegate to the Republican Party National Convention several times (1992, 1996, 2000).

He was first elected in 2003 and served along with fellow Republicans Michael D. Smigiel Sr. and Mary Roe Walkup.

In 2002, he defeated Democratic incumbent Wheeler R. Baker for the seat in Queen Anne's County.

[2] As a member in the Maryland House of Delegates, Sossi was appointed to be the Deputy Minority Whip in 2007.