Hannahs became the 29th head coach of the Indiana State Sycamore baseball team on July 26, 2013 after serving as president at Lincoln Trail College in Robinson, Ill., for the past three years and head baseball coach at LTC before that. He earned several Missouri Valley Conference honors during his ISU career including being named to the All-Century Team, a three-time selection to the MVC All-Conference team, a member of the 1987 MVC All-Tournament team, and was named to the MVC All-Academic team.
He was a member of some of the best Sycamore baseball teams in school history. The 1986 team finished 48-21, won the MVC tournament and the NCAA Mideast Regional, and advanced to participate in the College World Series. He accomplished a rare double that year as his American Legion team also reached the Legion World Series.
The 1987 team finished 45-18-1, was runner-up in the MVC tournament, and participated in the NCAA Central Regional tournament. After a 31-28 season in 1988 during his junior season, Hannahs led the team to the MVC tournament championship in 1989 and a spot in the NCAA South Regional. The 1989 team finished 48-21.
During his Indiana State career, Hannahs posted numbers that put him in the top 10 of seven career categories including first in singles (206), second in runs scored (220) and hits (274), tied for second in stolen bases (77), third in walks (138), fourth in triples (23), and seventh in at-bats (728). He also is in the top 10 of five single season records including first in stolen bases (43 in 1989), singles (79 in 1989), tied for first in triples (10 in 1987), fifth in batting average (.428 in 1989), and fifth in runs scored (78 in 1987).
He was drafted in the 16th round by the Milwaukee Brewers and played five seasons in the Brewer organization. Hannahs was the hitting and infield coach at Indiana State for four seasons (1995-1999) and pitching coach for one season (2000-2001). As an assistant, ISU won the 1995 MVC Tournament and played in the NCAA Midwest II Regional with the team finishing the season second in the nation in batting with a .340 average.
Hannahs was head coach at Lincoln Trail College in Robinson, Ill., for nine seasons where he led the Statesmen to Region 24 titles in 2005 and 2007, and the Great Rivers Athletic Conference championship in 2006 and 2007. He was inducted into the first class of the Ohio Valley Athletic Conference Hall of Fame in recognition of his accomplishments at Skyvue High School while playing basketball and baseball.