Martin McKinney (born August 27, 1971) is a Canadian-born, American raised record producer and songwriter. Professionally referred to as Doc, McKinney was formerly one half of the former duet (now solo act) Esthero, alongside Jenny Bea Englishman. His work with Toronto artist The Weeknd, whose McKinney-produced mixtapes House of Balloons and Thursday. were freely released in 2011, was met with widespread critical acclaim. He began working with major artists such as Drake. Due to recent tweets by Illangelo and favorited tweets by The Weeknd on Twitter, it is believed McKinney is working on a 2014 or 2015 album for The Weeknd that will be inspired by House of Balloons.