Thomas Glen Alexander (born August 8, 1935) is an American historian and academic who is professor emeritus from Brigham Young University (BYU) in Provo, Utah, where he was also Lemuel Hardison Redd, Jr. Professor of Western History and director of the Charles Redd Center for Western Studies.
Alexander was born in Logan, Utah to Glen M. and Violet B. Alexander. He was raised in a working-class section of Ogden, Utah and from 1956 to 1958 he served a proselytizing mission for The Church of Jesus Christ of Latter-day Saints (LDS Church) in the West German Mission. In 1959, he married Marilyn Johns, with whom he would have five children.
Alexander earned his A.A. in 1955 at Weber State University, and his B.S. in 1960 and M.A. in 1961 from Utah State University. While in Logan, Alexander first met Leonard Arrington, who was in the university Stake Presidency. In 1965, Alexander received his Ph.D. in American History from the University of California, Berkeley.
Alexander joined the BYU history faculty in 1964, where he has taught Utah history and American environmental history, and is currently the Lemuel Hardison Redd, Jr. Professor of Western American History, Emeritus. In the past, he has also taught at Utah State University, the University of California, Berkeley, the University of Nebraska at Kearney, Southern Illinois University, and the University of Utah. He has received BYU's highest faculty award, the Karl G. Maeser Distinguished Faculty Lecturer Award. In 2001, he received the Emeriti Alumni Lifetime Achievement Award from Weber State University. Alexander retired from full-time teaching at BYU in 2004.