All I know is the results of his experiments listed on wikipedia and they aren't so great.
In 1987, Carson was the lead neurosurgeon of a 70-member surgical team that separated conjoined twins, Patrick and Benjamin Binder, who had been joined at the back of the head (craniopagus twins); the separation surgery held promise in part because the twin boys had separate brains.[31] Both boys entered the hospital "giggling and kicking" in preparation for surgery without which, it was said at the time, the seven-month-old twins would never have been able to crawl, walk, or turn over.[31] The Johns Hopkins surgical team rehearsed the surgery for weeks, practicing on two dolls secured together by Velcro.[31] Although follow-up stories were few following the Binder twins' return to Germany seven months after the operation,[31] both twins were reportedly "far from normal" two years after the procedure, with one in a vegetative state.[31][32][33][34] "I will never get over this . . . Why did I have them separated?" said their mother, Theresia Binder, in a 1993 interview.[31] Neither twin was ever able to talk or care for himself, and both would eventually become institutionalized wards of the state.[31] Patrick Binder died sometime during the last decade, according to his uncle, who was located by the Washington Post in 2015.[31] The Binder surgery served as blueprint for similar twin separations, a procedure which was refined in subsequent decades.[31] Carson participated in four subsequent high-risk conjoined twin separations, including a 1997 operation on craniopagus Zambian twins, Joseph and Luka Banda, which resulted in a normal neurological outcome.[31] Two sets of twins died, including Iranian twins Ladan and Laleh Bijani; another separation resulted in the death of one twin and the survival of another, who is legally blind and struggles to walk.[35]
According to the Washington Post, the Binder surgery "launched the stardom" of Ben Carson, who "walked out of the operating room that day into a spotlight that has never dimmed", beginning with a press conference that was covered worldwide, which created name recognition ultimately leading to publishing deals and a motivational speaking career.[31] On the condition the film would have its premiere in Baltimore,[31] Carson agreed to a cameo appearance as "head surgeon" in the 2003 Farrelly brothers' comedy Stuck on You, starring Matt Damon and Greg Kinnear as conjoined twins who, unhappy after their surgical separation, continue life attached to each other by Velcro.[31][36]