When I was an altar boy I served Mass for a newly ordained priest named Fr. Robert Allmendinger. He later left the active ministry (I am not sure why) and was featured on a local investigative news feature called 'Shame on You'. He was presenting himself as a Catholic priest and marrying people but they were later finding out that he was not a priest in good standing. He now seems to have shorted his name to Robert Allmen and is calling himself a bishop (complete with snazzy bishop type outfit!). He has a second almost identical website here. I don't know if he is still doing the rent a priest thing here but he was 'returned to the lay state' as of November 9, 2011. So he is no longer a Catholic priest, and has not been a priest in good standing from long before that. I hope Catholics of Long Island realize that this man is not an active Catholic priest and if they want a Catholic wedding it will be inside a Catholic parish.
Update: Based on this thread on Liweddings.com some people still think he is a Catholic priest. Apparently he founded his own church called the Good Shepherd in Hamptons Bays (this is not a Catholic Church).
Related: Deacon Greg Kandra of The Deacon's Bench discusses the important question of "Why can't a Catholic get married outside of a Church?".