In his tenure, he has sent four players to the Pro Bowl. A disciple of the 3-4 defense, he was thought to be a favorite if San Diego lost Wade Phillips.
"I was extremely impressed with Greg during the interview process. He did a great job under Wade Phillips in San Diego and played a key role in helping the Chargers' defense get to the top of the NFL," 49ers head coach Mike Nolan said. "I am very familiar with what Greg did in San Diego since I worked with Wade for a number of years in Denver. Greg is familiar with what the 49ers do defensively which is important from a consistency standpoint. However, with his experience he will also be able to bring new ideas to our organization. It is very important for each member of my coaching staff to be an excellent teacher, and Greg certainly fits that role."
The Chargers will again look in-house for his replacement. John Pagano is the early favorite. Pagano, in consideration to go to North Carolina and join his brother, is the assistant linebackers coach who works directly with the team's outside linebackers.
Pagano has been with the Chargers for five years, has spent the last two as the assistant linebackers coach after spending the previous three as the defensive assistant/quality control.