Leo P. O'Brien (July 20, 1893 – March 25, 1968) was a member of the Wisconsin State Senate from the 2nd District. Biography O'Brien was born on July 20, 1893, in Fond du Lac, Wisconsin. He attended the University of Wisconsin-Madison, Marquette University and St. Norbert College. During World War I and World War II, he served with the United States Navy. He died in 1968 of a heart attack. Political career O'Brien was a member of the Senate from 1953 to 1964. He was a Republican. References 1893 births 1968 deaths Politicians from Fond du Lac, Wisconsin Republican Party Wisconsin state senators Military personnel from Wisconsin United States Navy personnel of World War I United States Navy personnel of World War II United States Navy sailors University of Wisconsin–Madison alumni Marquette University alumni St. Norbert College alumni 20th-century American politicians