He is a second-generation radio broadcaster. His father Bob Gelb had long reigns as the afternoon show producer at WFAN-AM and the morning show producer for Don Imus on WABC-AM in New York City.
Gelb, a Temple University grad, first entered broadcasting with the campus radio station WHIP-AM as a sports director and sportscaster. He would have an internship with WIP-FM in Philadelphia. He was the afternoon host on WNJE-AM in Trenton from June 2016 to March 2018. Gelb added duties as a host of a show following Philadelphia Eagles games on WPEN-FM in Philadelphia.
He went national on CBS Sports Radio Network as a weekend overnight host. Gelb was promoted to evening host and then became the afternoon host.
Gelb found additional work at SiriusXM Radio. He was a host on the NFL Radio channel and hosted a program on Mad Dog Radio. CBS Sports Radio Network rebranded to Infinity Sports Network in April 2024 and Gelb remained there as their afternoon host until December 2025.
He continues as an NFL studio host and men's college basketball studio host at Compass Media Networks. Gelb began as a Saturday mid-afternoon podcast host earlier this year with 365 Sports and Rogue Media Network. In addition to his new work at WQAM, Gelb has also been added by WEEI-FM in Boston as a fill-in host.