Massey linked with Sony Music chairman Rob Stringer to relaunch the iconic imprint in 2018.
Also this week: A new head of A&R at Joie Manda's Encore Recordings, Symphonic elevates three, and a Beggars Group mainstay joins Exceleration.
The former president of Three Six Zero is based at the label’s New York headquarters.
Zeidman, who has an official end date no later than Oct. 31, will assist with the leadership transition.
Also this week: Earl Sweatshirt's manager joins ATC, TikTok makes a key hire ahead ahead of ban-day (April 5) and Big Loud Records loses an svp of marketing.
Japanese entertainment company Avex is making a major move to increase its presence in the U.S.
The company plans to double its investment in its electronic music management division, with CEO and founder Lucas Keller predicting "another large acceleration" for the genre.
Zimmer will continue to serve on UTA's board, which will still be led by Paul Wachter.
The radio giant's strategic leadership changes include the departures of chief operating officer Susan Larkin and general counsel Andrew Sutor, among others.
Also this week: It's growth time at The Apollo, Round Hill adds two C-suiters and an Audacy programming veteran announces he's going solo.