Endersby was born and raised in Canada and picked up his first guitar at an early age, joining his first band while still in high school. By 1966 he was living in Toronto and having some success with his newest group, Just Us. In 1969 Endersby left his homeland to move to Europe where he teamed up with bassist Pete Quaife, drummer Mick Cook, and keyboardist Marty Fisher to form a band called Mapleoak. In 1970 the group began touring, and released a self-titled debut album a year later. By the time the full-length offering hit the market, Mapleoak had fallen apart. Endersby simply picked up and moved back home to Canada.
In the '80s Endersby headed to the United States where he formed the Springfield Band in L.A. After a few years that group met its end as well, and he headed home once more. There he went on to work with other groups, and became an often-requested session guitarist. ~ Charlotte Dillon, Rovi