Dave Sims is set to replace John Sterling as the Yankees radio voice on WFAN, the station announced. So who is he?

Dave Sims, who has spent the past 20 years calling Mariners games, will replace John Sterling as Suzyn Waldman's play-by-play partner on Yankees radio broadcasts.

Sims, known for signature calls such as “Hey now” and “Giddy up, baby,” has been the Mariners’ television play-by-play man since 2007. The Philadelphia native will now join the 78-year-old Suzyn Waldman, Sterling’s longtime broadcast partner, in the Yankees’ radio booth. WFAN is close on a deal to hire Dave Sims as John Sterling’s replacement.