After a decade of being chairman and CEO of Associated Medical Professionals (A.M.P.), DR. HOWARD WILLIAMS will be retiring. DR. ANGELO DEROSALIA will be the new chairman and CEO as of March 1, leading the multispecialty medical practice. DeRosalia, a urologist and member of A.M.P., has been with the company since it was formed in 2008. In the last 10 years, he has contributed to pioneering minimally invasive treatments. DeRosalia previously was chief of the urology service at St. Joseph’s Health and will continue to see his patients at the A.M.P. North Medical location in Liverpool.