Born in Caldwell, Idaho Territory, Coffin attended Yale University's Sheffield Scientific School, where he was a member of St. Anthony Hall, and was graduated from the law department of Yale University in 1910.
Coffin was born in Caldwell. Coffin attended Yale University's Sheffield Scientific School. Coffin was graduated from the law department of Yale University in 1910. Caldwell was Idaho Territory. He was a member of St. Anthony Hall.