among killen's more recent credits, he mixed sugarland's multi-platinum "love on the inside" featuring three chart singles in "all i want to do", "already gone" and "it happens", all number one hits on the billboard country singles charts. in 2014, he mixed suzanne vega's latest release "tales from the realm of the queen of pentacles" and recorded david bowie's single "sue (or in a season of crime)" from his release, "nothing has changed".