At the World Traditional Karate Organization (WTKO) 2003 North American Karate Championship, he took second place in both Men's Black Belt Individual Kumite and Men's Individual Kata. At the 2009 Maccabiah Games Sternberg won a bronze medal in the Kumite Up To 60k, as part of the Team USA Karate Team. He won a gold medal as part of Team USA in the 2013 Maccabiah Games in Team Kata.