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John Fish, the construction magnate who has been a driving force behind Boston’s bid for the 2024 Olympics, will step down as chair of the Greater Boston Chamber of Commerce.

Fish, CEO of Suffolk Construction, started a two-year term in May, around the time the city’s prospects for the Summer Games began gathering momentum. Since, Fish has been working both publicly and privately to solidify the bid, which the US Olympic Committee selected earlier this month as its choice over three other applicants.

Fish told a South Shore Chamber of Commerce luncheon he planned to give up the Boston Chamber post to focus on Suffolk and the Olympics, said an attendee.


At the chamber, Fish succeeded Karen Kaplan, CEO of Hill Holliday.

His departure would also come as the Chamber is in line for a new president. Current president Paul Guzzi announced in September he would retire this year.

Jim O’Sullivan can be reached at jim.osullivan@globe.com. Follow him on Twitter at @JOSreports.