About Us

Principium Psychiatry

Our clinic specializes in the comprehensive treatment of mood and anxiety disorders. Located near Carnegie Hall, we offer numerous types of treatments tailored to each individual’s needs. Treatment types include: psychotherapy, psychopharmacology, TMS, and ketamine.

Principium Psychiatry offers state of the art medicine in the heart of New York City.

We welcome local and international clients.

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We welcome local and international clients

Cutting Edge Treatment In The Heart Of NYC

Ziv E. Cohen, M.D., F.A.P.A.

Medical Director

Specialization: Psychiatrist


Joseph Houchins, DNP, PMHNP-BC, MA

Nurse Practitioner

Specialization: Psychiatric and Mental Health


Daniel Santarsieri, MD


Specialization: Psychiatrist


Reed Maxwell, Ph.D., ABPP

Specialization: Psychologist


Rivka Moskowitz, PMHNP-BC, MSN

Nurse Practitioner


Warden Prescott, PhD, LMSW



Anna Higgins, PMHNP-BC

Psychiatric Nurse Practitioner


Tess Anderson, PMHNP

Psychiatric Mental Health Nurse Practitioner

Specialization: Psychiatric Nurse Practitioner


Amy Barr, CAT-LP

Specialization: Art Therapy, Psychotherapy


Why Choose Principium Psychiatry?

At Principium, we’re dedicated to providing the best mental health treatment possible using insights from multiple medical disciplines. Our staff members have attended and taught at respected institutions — including Yale University, Binghamton University, Columbia University and Cornell Medical College — and they have expertise in cognitive-behavioral therapy, child and adolescent psychiatry and other areas.

All of our team members bring a caring, patient-centered and compassionate approach to their practice and will do whatever they can to make you feel comfortable, welcome and heard at every appointment. Our staff often brings their ideas and knowledge together to find the most effective and comprehensive treatment options for patients.

With caring, knowledgeable staff and the most current treatments, our psychopharmacology office in New York City is equipped to care for mood and anxiety disorder patients with a variety of symptoms and needs. We are one of few psychiatric clinics in New York licensed to provide TMS, ketamine, buprenorphine, as well as cutting edge medication therapy and a range of psychotherapies.

Schedule an Appointment Today

Whatever mental health symptoms you’re experiencing, seeking professional help is the best way to move forward and feel better. At Principium Psychiatry, we’re here to support you every step of the way. To start feeling better, please reach out online or call our Manhattan office at 917-993-5018 to schedule an appointment today.

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What Our Patients Say

The treatment was so much more comfortable than I thought it would be. I experienced slight discomfort during the first two treatments, but it was smooth sailing from then on!


Before starting TMS, I was so depressed that I couldn’t eat, sleep or get out of bed. I had stopped doing the things I enjoyed entirely, because I didn’t have the energy or interest. It took a few weeks, but I started to notice myself thinking more positively and it kept improving from there. Thank you, Dr. Cohen!


My depression improved dramatically throughout the course of my TMS treatment. I am finally able to sleep through the night and am looking forward to living my life again. My entire family noticed the difference in me before I did. TMS changed my life after decades of failed medications and terrible side effects. I finally feel like “me” again.


Dr. Cohen and his team are so fantastic! They did everything they could to make me feel comfortable, and I started feeling better after the first dose of Ketamine!

Verified Patient

I am so thankful to Dr. Cohen and his team! Thanks to them and the Ketamine treatment, I’m feeling better than I have in years. I was pleasantly surprised that there were no side effects.


The suite in which I received the treatment was comfortable and welcoming. I was able to relax during the treatments and each time I left, I felt more at peace.


Our Affiliates

Organizations we are affiliated with.

Ready to Get Started?

All appointments are in the comfort of our discrete midtown office near Columbus Circle.

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