Hoping to rebound from their loss to the Chiefs, the Chargers played on home ground for and AFC duel with the Jaguars. In the 1st quarter, San Diego took the early lead as FB Mike Tolbert made a 2-yard TD run. The Jaguars replied with kicker Josh Scobee hitting a 44-yard field goal. The Chargers increased their lead as QB Philip Rivers completed a 9-yard TD pass to TE Antonio Gates. The Jaguars tried to cut the lead with Scobee nailing a 48-yard field goal. The Chargers continued to score with Rivers making a 4-yard TD pass to Gates; followed in the 3rd quarter by kicker Nate Kaeding getting a 41-yard field goal. In the 4th quarter the Chargers continued to dominate with FB Mike Tolbert getting a 1-yard TD run, followed by Rivers completing a 54-yard TD pass to WR Malcolm Floyd. The lead was slightly narrowed when QB David Garrard made a 3-yard TD pass to WR Mike Sims-Walker.

Based on the above article, answer a question. Who is the Jaguars quarterback?
David Garrard