Jon Heacock (born October 11, 1960) is an American college football coach and former player. He is the defensive coordinator at Iowa State University. Heacock served as the head football coach at Youngstown State University from 2001 to 2009, compiling a record of 60–44. He was an assistant coach at Youngstown State for seven seasons (1991–1996, 2000) under Jim Tressel.
In his first year at Youngstown State, Heacock served as defensive backs coach as the Penguins finished 12–3 and won the Division I-AA national championship. During the next five seasons (1992–1996) he was promoted and served as the defensive coordinator. Youngstown State advanced to the I-AA title game for four consecutive years, winning in 1991 over Marshall, losing to Marshall in 1992, rebounding with a victory over Marshall 1993, and beating Boise State in 1994. Youngstown State finished 3–8 in 1995 and 8–3 in 1996, bringing the Penguins' record to 61–19–2 during Heacock's six-year stint as an assistant. Heacock left YSU for a period of three years to serve as the defensive coordinator and defensive backs coach at Indiana University. He returned to Youngstown State in 2000 as the defensive coordinator. His defense was ranked 15th in the nation in scoring allowed and the Penguins finished 9–3.
In 2013, Heacock left Kent State to take the Safeties Coach position at Purdue, following Darrell Hazell. In 2014, Heacock returned to the MAC when he was named the defensive coordinator for Toledo.
In January 2016, when Matt Campbell became head coach at Iowa State, Heacock followed him to serve in the same position as defensive coordinator and safeties coach. Heacock initially ran a 4-3 or 4-2-5 defense in 2016 Iowa State Cyclones football team. However, Iowa State would later become known for its 3–3–5 defense that debuted in Iowa State's game against Texas in 2017. The 2017 Iowa State team would later upset 3rd-ranked Oklahoma and 4th-ranked TCU, ending the season leading the Big 12 in tackles for loss. Heacock was a finalist for the Broyles Award at the season's end. In 2022, the Iowa State defense led the conference in total defense, scoring defense, passing defense, and rushing defense. Heacock was named a nominee for the Broyles Award in 2022 as well as in 2024.
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