Oak Hill Psychological Services (OHPS) offers psychotherapy and assessment services for children, tweens, adolescents, adults and families.

Currently, our staff is comprised of three independent mental health providers: a Clinical Psychologist, a Licensed Social Worker and a Physician’s Assistant in Psychiatry. Our practitioners have extensive education, training and experience in clinical practice.

Meet Our Providers

Hayley B. Sherwood, Ph.D.

Dr. Hayley B. Sherwood, the owner of Oak Hill Psychological Services, is a Clinical Psychologist in Northern Virginia with over twenty years of experience. In her clinical practice, she provides psychotherapy and assessment services to children ages six and older, adolescents and adults from a family systems and psychodynamic perspective. Dr. Sherwood also conducts psychological evaluations to include the assessment of IQ, learning, ADHD, and social and emotional functioning.

Dr. Sherwood received her doctoral degree in Clinical Psychology from Temple University in 2000. As a graduate student, she trained at the Philadelphia Child and Family Training Center and Devereux Day School. She later completed a formal predoctoral internship in Clinical Psychology at the University of Virginia Health Sciences Center, an American Psychological Association (APA) accredited training program. Dr. Sherwood also worked with emotionally disturbed and learning disabled youth and their families in a therapeutic day school in Northern Virginia, prior to joining a group private practice in Reston in 2003.

In her clinical work, Dr. Sherwood favors a holistic approach to treatment. She regularly consults with psychiatrists, mental health providers, physicians, school personnel, attorneys, and other professionals on her clients’ behalf as needed. Dr. Sherwood is a Board Member of This Is My Brave, an organization that promotes ending the stigma of mental illness through storytelling.

A native of New England, Dr. Sherwood is the mom of two teenagers, two dogs and a cat. She enjoys music, books, movies and yoga. Her favorite authors include Sheryl Sandberg, Brene Brown, Cheryl Strayed, Glennon Doyle Melton and Adam Grant.

Wendy N. Cohen, PA-C

Ms. Wendy N. Cohen is a 2008 graduate of the Master’s of Science in Health Science, Physician Assistant program at the George Washington University in Washington, DC. She graduated at the top of her class and is a part of the Phi Kappa Phi National Medical Honor Society.

Before transitioning her career into Psychiatry, Ms. Cohen worked in Neurosurgery at Virginia Neurosurgeons in Arlington, VA and in medical research at Harvard Medical School in Boston, MA. She is board certified with the National Commission on Certification of Physician Assistants. She is also a member of the American Academy of Physician Assistants and the American Association of Psychiatric Physician Assistants along with the American Academy of Eating Disorders.

Ms. Cohen treats both adults and adolescents with anxiety disorders, depression, bipolar disorder, PTSD and other trauma related disorders, OCD, ADHD, substance abuse issues, eating disorders and neuropsychiatric illness. She works in conjunction with Johns Hopkins University to treat teens and adults with Gender Identity Disorder.

Mackenzie L. Ayers, MSW, LCSW

Ms. Mackenzie L. Ayers is a Licensed Clinical Social Worker.  Ms. Ayers received her Master’s in Clinical Social Work from Virginia Commonwealth University, where she focused her studies and training in providing trauma-informed therapy to survivors of child abuse and their families.

After graduating, Ms. Ayers has provided therapy at several different levels of care, which include inpatient, residential, intensive in-home, and outpatient services.  She also received specialized training in the treatment of eating disorders.

In her clinical work with children, adolescents, and adults, Ms. Ayers pulls from psychodynamic, person-in-environment, and humanistic approaches, while implementing techniques and interventions from Cognitive Behavioral and Dialectal Behavior Therapies, as well as expressive therapies.  Ms. Ayers is a strong proponent of involving loved ones in her clients’ care and has experience leading caregiver support groups as well as family and couples therapy.

In her free time, Ms. Ayers enjoys dancing, exploring nature, traveling, and spending time with family. She also incorporates her clinical work into her downtime, volunteering to present and lead groups about mental health and recovery.