However, he switched career tracks and accepted a position at Greenberg Glusker in 1996 before eventually moving on to Ziffren Brittenham LLP in 2002.

[4][7][6] His clients included Vanessa Hudgens, Josh Gad, Snoop Dogg and Tyler Perry, as well as former NFL star Michael Strahan and MMA fighter Gina Carano.

[8][9] Through his work at Ziffren Brittenham LLP, Espinoza came to represent professional boxers Oscar De La Hoya and Mike Tyson.

[13] Under Espinoza's supervision, the Showtime-Mayweather deal accounted for the three highest-grossing pay-per-view events in television history — Mayweather-Canelo in September 2013, Mayweather-Pacquiao in May 2015, and Mayweather-McGregor in August 2017.

[1] Espinoza, along with the entire staff of Showtime Sports, was laid off in October 2023 when Paramount shuttered the division.