I am looking for an aggressive medical malpractice lawyer to represent my grandfather.?

My grandfather (82) is suffering from early dementia and had a few bouts with pneumonia. After he recovered from the pneumonia, he stayed in a rehab to regain his strength so he could return home. At the rehab, he suffered unnecessarily on at least 4 separate occasions due to the incompetence of the rehab staff which set him back terribly in his recovery. We are looking for someone in the Anne Arundel/Baltimore Co areas. My mother, his POA, has asked me to help her find a lawyer and I'm not sure how to select the best one.