The news was announced internally Thursday morning.
Coelen's exit comes as a surprise since he helped build Rdf's U.S. outpost into a formidable supplier for the past four years.
He had significantly expanded operations with a string of hires of senior executives over the past year, most recently leading ITV entertainment executive Natalka Znak, the co-creator and executive producer of ITV1 reality hits "Hell's Kitchen" and "I'm a Celebrity, Get Me Out of Here!" whose appointment as executive vp at RDF USA was announced Thursday morning, hours before Coelen's resignation.
Under Coelen, RDF Media USA, the company behind ABC's veteran "Wife Swap," has produced such reality series as "Secret Millionaire" and "Don't Forget the Lyrics" for Fox, "Find My Family" for ABC, as well as cable shows "Addicted to Beauty," "How to Look Good Naked" and