By REBECCA WALD It looks like Howard Stern’s denouncement of infant circumcision on his radio show over the years has left a big impression on the show’s researcher and segment producer, Will Murray. Yesterday, Murray spoke on Howard 100 News about the birth of his son, Owen. Murray was proud to say his boy is “au natural” and will not be circumcised. Howard 100 News broadcasts an hourly summary of stories related to Howard Stern on Sirius Satellite Radio. Part of Murray’s responsibilities as segment producer are to preinterview all of the guests and compile research notes for Stern to use during interviews. No doubt pre-interviewing Ron Low, who is an advocate of foreskin restoration and has appeared more than once on Stern’s show, gave Murray something to think about. It’s been widely reported that Murray won the Howard Stern staff I.Q. test with a score of 130. Yesterday’s announcement is further proof that he’s one smart cookie.