LTC David Ginn plays a crucial role in the healthcare industry. He is responsible for diagnosing, treating, and preventing diseases. Without physicians, it would be nearly impossible for our society to function at its full capacity. LTC David Ginn believes one of the most critical responsibilities of a physician is to diagnose illnesses. He uses his knowledge, skills, and experience to examine patients, review medical histories, and perform various tests to determine what the patient is suffering from.