O'Shea served as a graduate assistant for Houston in 1996 before being promoted to wide receivers coach in 1997. He became tight ends coach and special teams coach in 1998 and added recruiting coordinator to those duties in 1999. In 2000, O'Shea moved to the University of Southern Mississippi, where he served as special teams coach and recruiting coordinator through 2002.
Kansas City Chiefs
In 2003, O'Shea was a volunteer assistant as an assistant special teams coach for the Kansas City Chiefs under special teams coordinator Frank Gansz, a coach for Houston when O'Shea played there. He became a full-time assistant special teams coach for the Chiefs in 2004, spending two years in that capacity.
Minnesota Vikings
In 2006, O'Shea joined the Minnesota Vikings as an offensive assistant, working with the wide receivers in 2007 and 2008. Also in 2008, O'Shea added assistant special teams coaching responsibilities.
New England Patriots
In 2009, O'Shea became the wide receivers coach[1] for the New England Patriots. O'Shea won his first Super Bowl when the Patriots defeated the Seattle Seahawks in Super Bowl XLIX at the end of the 2014 season.[2] On February 5, 2017, O'Shea was part of the Patriots coaching staff that won Super Bowl LI. In the game, the Patriots defeated the Atlanta Falcons by a score of 34–28 in overtime.[3] O'Shea would stay with the Patriots until the 2019 season.[4] He won his third Super Bowl title when the Patriots defeated the Los Angeles Rams in Super Bowl LIII.[5]
Miami Dolphins
On February 8, 2019, the Miami Dolphins announced O'Shea as their offensive coordinator[6] when he joined Brian Flores[7] with the Dolphins. On December 30, 2019, O'Shea was fired by the Dolphins after one season.[8]
Cleveland Browns
On January 19, 2020, O'Shea was hired by the Cleveland Browns[9] as their wide receivers coach and passing game coordinator[10] under head coach Kevin Stefanski who he coached alongside when he was with the Vikings. O'Shea missed the team's week 17 game against the Pittsburgh Steelers in 2020 due to COVID-19 protocols.[11]
Personal life
O'Shea and his wife Melissa have three children: daughters Claire and Grace, and son Michael.