Janet Schwartzenberg, MD. Ryan Batson Smithee MD. Susan Wingo, MD. Melissa Aguirre-Holland, MBA, MSN, FNP-BC. Dana Davenport APRN, MSN, FNP-C. 1900 Coulter Office ... Main Office - 1215 S Coulter Street. 1215 Coulter Street Location. Amarillo Medical Specialists Patient Portal If you have used our portal, please participate in our survey! Click ....