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Hennessey joins the UWG staff after spending nine seasons at Emmanuel University where he served as the associate head coach and pitching coach. A veteran college pitching coach with 18 years of experience, Hennessey has coached at two Division I schools and a Division II head coach.  
 
His nine seasons at Emmanuel he inherited a pitching staff falling near the bottom of most statistical catagories in Conference Carolina's, and turned it into one of the most competitive in the country. From 2020-2025, his staff finished in the top 40 nationally in either ERA, strikeout-to-walk ratio, walks allowed, or home runs allowed. 
 
Before his stint at Emmanuel, Hennessey served as the interm head coach for Division II Young Harris College for a season, and before that was the pitching coach and recruiting coordinator. Under his guidence at YHC, the Mountain Lions won more games than in any season since 2014, and as pitching coach, he lowered the teams' ERA by two full runs.

Prior to Young Harris, Hennessey spent two years at the University of Texas Rio Grande Valley as the pitching coach from 2013-2014 and lowered the inherited staff's ERA from 4.25 to 3.84 in the 2014 season, the lowest at the school since 1992. That season, he mentored Sam Street, the Western Athletic Conference Pitcher of the Year, who tied for first in the NCAA Division I in wins (12) and complete games (11), ranked 25th nationally in ERA (1.81) and was later drafted by the Pittsburgh Pirates. 

Pervious coaching stops at Gavilan College in 2009, helping lower their teams' ERA by over three runs. A stop with the Peninsula Oilers of the Alaska Baseball League in 2009, Hennessey led them to lead the ABL with a 2.40 team ERA. He spent four years at Cabrillo College from 2009-2012 and helped guide them to the largest single-season turnaround going from 6-30 to 23-13 as well as the programs' first regional appearance in 10 years.

Hennessey has helped develop multiple pitchers who went on to play professionally, including four who reached the Major Leagues. A four-year letterman as a pitcher at San Jose State (2004-08), he is also a graduate of the SJSU program. Coach Hennessey is married to his wife Suzanne, they have a daughter Savannah, and son Brody. 

Major Leaguer's Developed Under Hennessey
Shane Carle (Atlanta Braves) Reached MLB
Kyle Barraclough (Miami Marlins) Reached MLB
Chad Smith (Detroit Tigers) Reached MLB
Scott Snodgress (Chicago White Sox) Reached MLB
Kevin Rath (Chicago White Sox)
Cody Kendall (Texas Rangers)
Josh Corrales (Seattle Mariners)
Sam Street (Pittsburg Pirates)
Alex Hensen (Los Angeles Angels)
Matt Daniels (Colorado Rockies "Director of Pitching")