No, Leonard Gosch is not involved in the search for Johnny - at least not with the JG Foundation. He may be looking on his own, but this is unknown.
His absence has caused some to question if he may have had some involvement with Johnny's abduction. There has been evidence uncovered involving some unsavory financial dealings involving him (post-abduction) and some have speculated that he may have accrued debts to people who demanded Johnny as payment. Again, this is just speculation by some and is not supported by the JG Foundation. My observation is that Noreen seems open to investigating any possible links between the abduction and Leonard, but compelling evidence has yet to be found.
There is the story of how Leonard was bringing a woman with him to various events involved with the investigations and introducing her as Noreen, when she was not Noreen at all. Also, Leonard is claimed to have sabotaged a police stakeout at a farmhouse that was allegedly used to hold Johnny at one point. If true, these stories do indicate a less than helpful track record of Leonard's participation in the search and could explain why his presence is not missed.
One recent poster on a different site has claimed that Leonard actually appeared in a child




film created in the 1970's. This film is among a series of films created prior to the law making the production or possesion of these films illegal (yes, there was a time when no laws existed banning such films). These films were created by a company that still exists and are well-known in child




circles. An effort is being made to either confirm or deny this claim since it is so specific and should be easy to verify by LE with access to these films.
This poster has also made some rather sensational claims against various famous people in his same posts - none of which have been verified - so please remember: ONLY ONE PERSON IS MAKING THIS CLAIM AGAINST LEONARD AND THE POSTER'S TRUTHFULLNESS IS UNKNOWN. I personally make no claim of Leonard's involvement and, if forced to vote one way or another, I would say that these charges are false. They are shared here in the interest of full disclosure and if this violates the TOS, the MODS should edit as necessary with my blessing.