He has previously played for the San Francisco Dragons and the Los Angeles Riptide of Major League Lacrosse (MLL).
Brian Kelly started his professional career in 2003 as a member of the Anaheim Storm of the National Lacrosse League (NLL).
He was drafted by the LA Riptide then after 2 years, Kelly was claimed by the San Francisco Dragons from the league player pool on March 19, 2007.
Over his nine years he accumulated a record of 60–49 and totaled five winning seasons, which included a berth into the NCAA Division III National Championships in 2016.
He is now the director of 3d Southland, the regional designation of 3d Lacrosse covering Orange County and the Greater Los Angeles Area of Southern California.