Joop Kasteel, also known as "de zwarte parel" ("the black pearl", born 27 August 1964), is a Dutch former mixed martial artist. He made his mixed martial arts debut on 15 June 1996. He is a veteran of the RINGS promotion and as he has fought the majority of his fights for them.[1]
Kasteel's trainers were Chris Dolman, Hans Nijman and Michel van Halderen he also stated he trained with "Dirty" Bob Schrijber. As a former bodybuilder he went into the MMA world & became one of the most popular Dutch fighters noted for his power and physique, normally weighing in at around 265 lbs.