Hera OB-GYN Medical Group. Esther J. Tow-Der, M.D. Rocio Acera Pozzi, M.D. Matthew L. Tilstra, M.D. Carson D. Rodeffer, M.D. Casey E. Richardson, M.D. Nicholas H. Hopkins, M.D. Hera ~ the Greek goddess of women, marriage and childbirth. Our office adopted this namesake with the mission of providing the best medical care relating to women's ....