I have known Mark for a little over 6 months now so I've been able to experience his level of knowledge, professionalism, and dedication to his patients. His ability to navigate and understand the hospital system is unmatched, he knows exactly what he's talking about and one thing I love about the business model for Preventive Medicine and Cancer Care is that they always do what's good for the patient, there is no conflict of interest with the hospital because the hospitals don't regulate the care. Completely recommend.