Richard came over from the Chicago White Sox as part of the Jake Peavy trade in July 2009, and Richard made his first start with the Padres in August. He would finish the year with 12 starts, posting a 4.08 ERA.
Between 2010 and 2012, Richard established himself as a dependable rotation piece with a 3.75, 3.88, and 3.99 ERA each year.
Richard fell off the wagon in 2013 with a 7.01 ERA through his first 11 starts and a career-worst 1.633 WHIP. The Padres attempted to demote him after the year, he refused and elected free agency.
He returned to San Diego in 2016 after being released by the Chicago Cubs. To close out the year, Richard made 11 appearances – including nine starts and a career-best 2.52 ERA. He would stick around the 2017 and 2018 seasons, but he was limited by a knee injury in August 2018.