Columbia County resident William Culley, age 57, of Chatham, was arrested Saturday, March 18, according to State Police.
After being tipped off, investigators determined that Culley was practicing as a psychotherapist without a license, police said.
He specializes in treating those recovering from a traumatic brain injury, as well as attention-deficit/hyperactivity disorder (ADHD) and other behavioral issues, according to his profile on Psychology Today.
Culley is facing one count of unauthorized practice of a profession, a felony.
He was issued an appearance ticket to the town of Austerlitz Court on Wednesday, March 22.
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