Mark Warren Spoelstra (June 30, 1940 – February 24, 2007)[1] was an American singer-songwriter and folk and blues guitarist.
His career was put on hold from 1963 to 1965, when he performed alternative service as a conscientious objector in Fresno, California.
In 1969, while living in Sonoma County, California, he formed the Frontier Constabulary with Mitch Greenhill and Mayne Smith.
[1] Withdrawing from the touring life to raise a family, Spoelstra and his wife Sheri embraced Christianity.
[1] Retiring from music in the early 1980s, he worked for a number of years as a tour bus driver in Yosemite National Park.