David MacKenzie, who had been a mineral and oil exploration geologist at Marathon Oil Co., died May 13, 2019, at the age of 92.

MacKenzie was born in Canada and immigrated to the United States to attend the California Institute of Technology, from which he earned a bachelor’s degree in geology in 1950.

He earned a Ph.D. in geology from Princeton in 1954. His job as an exploration geologist at Amoseas took him to Libya, Turkey, France, and Spain. Later, MacKenzie joined the Ohio Oil Co., now Marathon Oil, where he enjoyed a successful decades-long career while residing in Littleton, Colo.

MacKenzie was president of the Rocky Mountain Association of Geologists and served on the Littleton School Board. For many decades, he was a keen hiker and skier.

He is survived by his wife, Mary Janet, whom he married in 1954; four children; and seven grandchildren.

Graduate alumni memorials are prepared by the APGA.