Knowlton co-invented Ji Ga Zo with Mark Setteducati, released in the United States on March 30, 2011.
nˈoʊltən kˈoʊɪnvˈɛntᵻd dʒˈaɪ ɡˈɑː zˈoʊ wɪð mˈɑːɹk sˌɛɾɪdʒuːkˈɑːɾi, ɹᵻlˈiːst ɪnðə juːnˈaɪɾᵻd stˈeɪts ˌɔn mˈɑːɹtʃ θˈɜːɾi, tˈuː θˈaʊzənd ɪlˈɛvən.