Geason, 6-3 and 274 pounds, was originally signed by the Dallas Cowboys as a rookie free agent out of Tulane in 1998. He has played 26 career games over three seasons, with three starts. After being cut by the Cowboys during his first training camp, he 27-year-old Geason joined Amsterdam of the NFL Europe League in 1999 and caught 30 passes for 299 yards and a team-leading 5 touchdowns, earning All-NFL Europe honors.
Geason spent part of the '99 season on the Pittsburgh Steelers practice squad, then earned a roster spot there in 2000. He had three starts for the Steelers before his season was cut short by a knee injury. Geason was out of football for the first half of the 2001 season, then rejoined Pittsburgh and played in the final seven games of that season. The Steelers cut Geason during 2002 training camp, but the tight end, known for his blocking ability caught on with Buffalo for part of the that season before being placed on waivers Nov. 18, 2002.