Dr. Marks is very well versed in nutrition and functional medicine, which is why I have been a patient of his for some time. My situation has been a major challenge both for me and a host of practitioners and Dr. Marks continues to seek treatment modalities that will help. He has sent me to various referrals and where applicable, integrates what is useful. He is the easiest practitioner to deal with and I look forward to my visits. I am certainly a test case for him and he always listens to what research I have uncovered. That does not normally happen with other practitioners.