Mikey Havoc first became a DJ on the University of Auckland's 95bFM radio station in the early 1990s. He was on the breakfast show from 1996 to 2002, winning Best New Broadcaster at the 1997 New Zealand Radio Awards and later moved to the afternoon-evening "Drive" show. He once again took over as the breakfast show host in 2006. In 2010 Havoc returned to his Drive slot and in 2012 joined rock station Hauraki on weeknights 7-10 pm. He returned to 95bFM from 2017 to 2019 for a third stint as breakfast show host.

Mikey is the lead singer of the New Zealand rock band Push Push, best known for its 1991 number-one singles 'What My Baby Likes' and 'Trippin''. During the late 1990s he owned and managed The Squid nightclub in inner-city Auckland.

In the mid-nineties, Mikey moved into television on New Zealand's with the magazine-style TV show Havoc with his 95bFM co-worker Jeremy Wells and continued on TVNZ with the shows Havoc and Newsboy's Sell-out Tour and Havoc's Luxury Suites and Conference Facilities. In 2002 Havoc was nominated for Best Presenter for Havoc Luxury Suites and Conference Facility in the TV Guide New Zealand Television Awards. In 2004 he moved to TV3 with Havoc Presents Quality Time and has hosted reprised versions of Top Town and Treasure Island.