EXHIBIT 99.6 CONSENT OF BOONE POWELL, JR. The undersigned, Boone Powell, Jr., hereby consents to being named in the Registration Statement on Form S-4 of American Oncology Resources, Inc. (the "Company") and any preliminary prospectus or prospectuses to be filed in connection therewith as a person to be appointed a director of the Company. /s/ BOONE POWELL, JR. --------------------------------------- Boone Powell, Jr.