Dr. Alan Copperman, director of the Division of Reproductive Endocrinology at Mount Sinai School of Medicine and a co-founder of Reproductive Medicine Associates of New York, officially starts his day at 7 a.m. and seldom is done sending his last e-mail before midnight. The 45-year-old has made New York Magazine’s Best Doctors list every year since  2002, the year after his private practice opened— and he and his team run one of the larger and more successful reproductive programs in the United States, spend every waking minute doing their best to help infertile couples become parents. On any given day, Reproductive Medicine Associates of New York, which Copperman founded with three other Mount Sinai alums, treats up to 200 patients while leading the way in research, particularly in the cutting-edge fields of egg freezing and embryo selection.