[2] He has also contributed as a guest musician on albums by Meryn Cadell, Sarah McLachlan, Taste of Joy, Julie Ann Bertram and Mae Moore.
He is currently playing with Alannah Myles and Ellis Meek and performing locally in Toronto.
Brennan was a founding member of the Vancouver band Odds in 1987; the same musicians also performed cover tunes locally under the name Dawn Patrol.
[11] Brennan performed with Luke Doucet as part of the NXNE festival in Toronto in 2002.
[12] He was the drummer for Doucet's 2004 album Outlaws[13][14] In 2018 Brennan continues to perform locally in Toronto with the band The Two Fours[15] and hosts an open mic at the Relish Bar and Grill.