When Dr. Stojan Adasevic was a medical student, he learned that he was a survivor of a failed abortion. Despite hearing that shocking news, he went on in his medical career to become expert at the very same procedure that caused his own mother's abortion to fail, thus saving his life. He became a master abortionist, performing twenty to thirty abortions in one day. In his twenty-six year career he estimated that he performed 48,000-62,000 abortions.
A more detailed account of Dr. Adasevic's experiences, that led to his abandoning his career as an abortionist and becoming a pro-life apostle, is here.