Jaylen Brown’s agent, Jason Glushon just negotiated the richest deal in NBA history for his client which allowed the Boston Celtics star to sign a five-year, $304 million supermax contract extension.

Glushon, said he and his client met with Celtics management on Sunday to finalize the contract. The currently contract put in place keeps the 26-year-old with the team until the end of the 2028-9 season.

Who is Jason Glushon?

Jason Glushon is the president and founder of Glushon Sports Management, which describes itself as “A full service sports agency for a select group of athletes, from start to finish.”

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Glushon lives in Los Angeles County, California. According to Forbes, Glushon left his job with agency giant Wasserman to start his own firm a week before graduating law school from Loyola in Los Angeles.

After starting his firm, Glushon Sports Management with only three employees including himself, he was able to negotiated two of the biggest deals in free agency at the time — Al Horford (four years, $113 million) and Jrue Holiday (five years, $126 million). 

Today, apart from Jaylen Brown, Glushon also has an array of other high-profile clients such as Trevor Booker, Jamaree Bouyea, David Crisp, Spencer Dinwiddie, Donte DiVicenzo and more.

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Beofre starting his own firm, Gloshon worked for Wasserman in 2006 as an assistant to uber-agent Arn Tellem. At the same time, he was pursuing a career as a baseball player in the Oakland A’s minor league system. He hung up his spikes in 2009 and became a certified NBA agent in 2013. At Wasserman, his first client was Xavier Henry, who he co-represented. Henry followed Glushon when the latter started his own firm.

Five years ago, Glushon told Forbes that he always wanted to run his own business, which meant his time at Wasserman was always limited. “I don’t think any split is a good split. Right now all is good, but things can change with the size of the deals I’ve been able to do,” Glushon said.