Psychiatric Mental Health
Nurse Practitioner

Kristen Marquis, PNHMP

Kristen Marquis, PNHMP

About Kristen Marquis, Lead Practitioner

Kristen Marquis, PMHNP-BC, MSN was born in Round Lake, NY and is a proud graduate of Sage College with a Master’s Degree in Nursing. She is a board-certified Psychiatric Mental Health Nurse Practitioner who is dedicated to providing care to adults, adolescents, and children.

Kristen has over 21-years of nursing experience. During this time, she has gained the expertise, competence, and confidence to provide quality, safe, evidence-based patient-centered care. She has practiced for over 15 years, in emergency medicine having cared for and met the needs of individuals with mental health disorders from common panic attacks to patients in full crisis. In addition to practicing in emergency medicine, Kristen has several years’ experience in private practice during which she provided medication management to children and adolescents in the foster care system. 

Kristen is a compassionate, empathetic, and honest practitioner who provides psychopharmacological treatment plans that are evidence-based and specific to patient needs. She ensures that medication management recommendations and decisions are jointly made with great consideration placed on patient’s preference, cultural beliefs, and specific diagnosis. Her expertise involves providing mental health evaluations, medication management, and brief psychotherapy to children, adolescents, adults, and geriatric patients. She is a firm believer in continuing education and strives to stay up-to-date on current evidence-based best practices. She is also a proud member of the American Nurses Association (ANA).

Kristen lives in Clifton Park with her husband, three children, and two dogs. She enjoys going to concerts, volunteering at the Ronald McDonald House, and exploring the world through traveling and reading.

Meet the Team

Kristen Marquis, PMHNP-BC
Nurse Practitioner of Psychiatry 

Board Certified Psychiatric Mental Health Nurse Practitioner, PMHNP-BC

Megan Sostre
Practice Manager 

Licensed Practicing Nurse, LPN

Megan is passionate about the mental health and emotional well-being of others. She has dedicated her life to the continual equipping of herself in order to help others. She is certified in mentoring couples through the Prepare & Enrich program and is a  certified Therapeutic Foster Parent and Adoptive mom. She is trained and experienced in facilitating groups through the Emotionally Healthy Leadership Course, and  currently serves as a Court Appointed Special Advocate for abused and neglected children. She brings all of her passion and preparedness into the management of this practice to create an atmosphere of care and healing.

Ein Marquis
Business Manager 

AAPC - Certificate Professional Coder CPC

Office Therapy Dog

Biscuit welcomes eveyone to the office. He is a lovable and essential member of our practice. Biscuit participates in play therapy sessions and works very hard to meet our patients needs. 

Denise Riley, PMHNP
Nurse Practitioner of Psychiatry 

Vsevolod Bakis, PMHNP
Nurse Practitioner of Psychiatry