 "New Techniques for the Bass Clarinet" (www.shoepair.com), which Bok wrote in 1989 (revised in 2011), is considered to be the standard work for instrumentalists and composers interested in extended techniques.In 2005 Bok was the initiator and artistic director of the first World Bass Clarinet Convention, which took place in Rotterdam and was attended by more than five hundred bass clarinetists from all over the world.Following his first piece "Vinho do Porto Brasileiro" (1997), Bok has written a large number of solo works and chamber music.