The most prominant, and only, one whose name I’m aware of is Dr. Bernard N. Nathanson. He was one of the founders of NARAL, and converted to Catholicism. I believe he is still around, and you might consider doing a Google search for contact information.
Also, a Google search for what you are looking for might turn up some names for you.
You may also check a pro-life chapter near you, they may have some information regarding what you are looking for. I remember viewing videos in the late 1980’s of interviews with doctors who performed abortions and later became pro-life activists.