In 1983 Keppler shared a Saturn Award nomination for best make-up in Star Trek II: The Wrath of Khan with fellow make-up artist James Lee McCoy. In 1988 he was nominated for two Emmy Awards for outstanding achievement in make-up for a series for the TNG episodes "Conspiracy" and "Coming of Age" alongside Michael Westmore and Gerald Quist in the previous one and Westmore, Quist, and his son in the latter one. The team won the award for the episode "Coming of Age".