.Nadine Walker. Her primary practice is as an Internal Medicine, also practicing as a Psychologist: Prescribing (Medical), an Internal Medicine: Addiction Medicine, a Preventive Medicine: Preventive Medicine/Occupational Environmental Medicine, a Preventive Medicine: Public Health & General Preventive Medicine, a Psychiatry & Neurology: Psychosomatic Medicine, a Psychiatry & Neurology: Psychiatry, and a Counselor: Professional.