[2] He served as a partner at the Kansas City, New York, and San Diego–based law firm, Stueve Siegel Hanson LLP.
Following completion of his service as attorney general, he became a partner in the Kansas City, Missouri, firm Stueve Siegel Hanson LLP.
He earned a jury conviction in 2008 of Kenneth Wilson for the first-degree murder of Scott Noel in Osborne County, Kansas.
He earned a jury conviction in 2009 of Israel Mireles for the capital murder of Emily Sander in Butler County, Kansas.
On March 9, 2011, President Barack Obama nominated Six to the United States Court of Appeals for the Tenth Circuit, to fill the vacancy left by Judge Deanell Reece Tacha who assumed senior status on January 27, 2011.