John Drennan was born in Chicago, Illinois. He graduated from high school at 17 and worked several summers on a farm including the milking of 30 head of Holstein cattle. In 1954 he started work for the Illinois Central Railroad as a flagman. Later he was hired as a fireman for the New York Central System and was promoted to examiner engineer in 1968. During the time he spent as a fireman and engineer he completed his Bachelor's Degree at the National College of Education in 1963. He was promoted to Road Foreman of Engines with the Penn Central in 1969 in Elkhart, IN.

John married Sarah Bonde in 1961 after meeting her in college. The Drennan's moved with their five children to the Upper Peninsula in 1970 following the bankruptcy of Penn Central. He took a job as an elementary teacher in the Baraga School System teaching for 13 years in Pelkie and 8 years in Baraga. He received his Master's Degree in Education from Northern University in 1975. Following his retirement from teaching, he did substitute teaching in all grades in the Baraga System

Potentate Drennan is a member of L'Anse Lodge #547, The Valley of Marquette A.A.S.R., the York Rite Bodies and he joined Ahmed Shrine in 1999.

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