Michael Gallagher is an American guitarist, best known for his work with post-metal band Isis. He joined them in 1999 for their debut LP Celestial, having previously been a member of Cast Iron Hike. He has an ambient project known as MGR (Mustard Gas & Roses); under this moniker he has released two albums and scored one film.
He plays a '78 Les Paul Custom, which he bought on eBay, through a Fryette Sig:x Amplifier. While playing in Isis he normally tuned his guitar down to Dropped B (B-F#-B-E-G#-C#), like his bandmate Aaron Turner.