Brown quits community job
But scrum-half Brown 30, who has played in almost 200 games and scored more than 900 points for Eagles, hopes to stay on as a player next season.
"An opportunity has come along which I couldn't turn down," said Brown.
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Hide Ad"I have put a lot of effort and heart and soul into the community work and I've had some great experiences.
"But I live in Leeds and I have a daughter of 17 months and a business opportunity has come up and I have to think about her and I have to take it. I hope to carry on playing - that's the plan."
Coach Mark Aston said Brown had done a "fantastic job for the club".
Rejoining the club to take over community work is former conditioner Dean Thomas.
Thomas, a former player at York, left Eagles in 2006 to coach Gateshead Thunder and last season was the conditioner at Salford Reds in the Super League.