Siemon graduated from Stanford University in 1972, where he starred as a middle linebacker on the Indians' famed "Thunder Chickens" defense, playing on two Rose Bowl-winning teams.

He earned the Silver anniversary Dick Butkus award his senior year (1971) as the nation's top linebacker, and the Pop Warner Award as the top senior player on the West Coast.

During that time, he was the starting middle linebacker in four NFC championship games over the course of five years (1973–1977), winning three: 1973, 1974, and 1976, losing one: 1977, and three Super Bowls (VIII, IX, XI), all losses.

During the prime years, he teamed up with excellent outside linebackers, such as Matt Blair, Roy Winston, and Wally Hilgenberg.

in Christian Apologetics, 1984) Subsequently, Jeff began and continues his work today as the Minnesota Search Ministries Division Director.