Doctor of defense

As an assistant with the Bears — he has worked under three head coaches, dating to 2013 — Sean Desai has taught offseason business courses at Lake Forest Graduate School of Management.In his first season as defensive coordinator, Sean Desai looks to spark a Bears unit with his teaching principles.

When Bears defensive coordinator Vic Fangio became the Broncos’ head coach in January 2019, he took two Bears assistants with him: defensive backs coach Ed Donatell, a three-time coordinator in an NFL career spanning almost 30 years, and little-known outside linebackers coach Brandon Staley, who would two years later become the Chargers’ head coach. To bring Sean Desai, who was under contract,…