Behavioral Health

Behavioral Health Services

Our Behavioral Health providers are prepared to support clients of all ages, addressing a wide range of challenges. We work alongside medical providers to integrate care for the body and mind with treatment plans tailored to each client or family’s individual needs. Our goal is to assist and empower our clients to tackle and overcome their personal struggles and improve their quality of life.

Behavioral Health Services Treat: 

  • Depression: feeling down, unmotivated, hopeless or worthless
  • Anxiety: excessive worries, fears, or panic
  • Attention Deficit Hyperactivity Disorder (ADHD): Difficulty managing impulses, focusing or containing excessive energy (affects children, teens and adults)
  • Stress from difficult life transitions such as divorce, separation, immigration, changes in family structure, job loss, major health issues or unexpected pregnancies
  • Trauma from the distant or recent past that is being re-experienced (flashbacks, nightmares), causing hypervigilance or negatively impacting your life. Examples of trauma include physical abuse, sexual abuse, emotional abuse, witnessing violence, natural disasters or being in a war zone
  • Substance Abuse that is negatively impacting your life or the life of your family
  • Behavioral or emotional difficulties in children, tweens, teens and emerging adults
  • Conflict with spouse or significant other
  • Grief over the death of a loved one
  • Lifestyle changes recommended by your medical provider such as changes in diet, exercise or reducing use of alcohol or tobacco
  • Any other difficulty that is causing you distress or difficulty functioning in your health, work, school or relationships

If you or someone you love is actively suicidal, please do not hesitate to call the National Suicide Prevention line at 1-800-273-8255 or chat online now at

What to Expect

The first step is to call our Behavioral Health Coordinators who will gather some brief information about your concerns. The Coordinator will arrange for an intake appointment with one of our Behavioral Health Consultants. The intake is usually a one-hour consultation to understand the background of the concerns and the current symptoms you or your child are experiencing. An intake will result in creating a treatment plan together with your Behavioral Health Consultant. Depending on availability and specialties, you will be assigned to a Behavioral Health Consultant to work towards your treatment goals. Typically, it is necessary to follow up weekly for at least the first 6 weeks, and many cases will resolve within 12 to 20 sessions. Consistent engagement in counseling sessions and recommended homework is essential for successful results. We accept most private insurances, Medicaid, Medicare, and have discount fee program for those without insurance. Services are available in English, Spanish, French and Creole. 

Meet Our Providers


Ramfis Marquez, PhD, LPC
Behavioral Health Director​

Dr. Ramfis L. Marquez is the Director of the Behavioral Health Department. He holds a Doctorate in Clinical Psychology and is a Licensed Professional Counselor in the State of Virginia. Dr. Marquez studied at Walden University and Inter American University of Puerto Rico and has worked in the field of mental health for 17 plus years. He has specialized experience working with Children, Adults, Geriatrics, Individual, Couples and Families in both English and Spanish. Dr. Marquez has developed expertise in the areas of Trauma, ADHD, Asperger’s Disorder (Autism Level 1), Depression, Anxiety and other DSM disorders. Dr. Marquez approaches therapy from a holistic perspective, using techniques from client focused, humanistic, motivational and reality based therapies.

In his free time, Dr. Marquez enjoys reading, music, history, stand up paddle boarding, cooking, dancing, playing the guitar, sports cars, martial arts and Science Fiction.

Greater Prince William Community Health Center Logo

Zaida I. Dayton, LPC
Behavioral Health Consultant

Zaida I. Dayton is a Bilingual Behavioral Health Consultant. She is a Licensed Professional Counselor in the state of Virginia and a Licensed Mental Health Counselor in the state of Florida. Ms. Dayton studied with the University of Phoenix, and obtained a Master’s of Science in Mental Health. She has counseled professionally for over 4 years. Ms. Dayton enjoys working with Children, Adolescents, Adults, Geriatrics, Individuals, Couples and Families in both English and Spanish. She specializes in the treatment of Trauma, ADHD, Anxiety, Depression, Eating Disorders, Grief, Relational problems, and other disorders. Ms. Dayton’s goal is to empower clients to make behavioral choices that will create the necessary changes to improve their quality of life. She employs techniques from Reality therapy, Cognitive Behavioral Therapy (CBT) and completed a Level 2 training on Gottman Method to Couples Counseling.

In her leisure time, Ms. Dayton enjoys volleyball, running, music, going to the movies, and spending time with family and friends.

Jean-Andre Constant, LCSW, CSOTP
Behavioral Health Consultant

Jean-Andre Constant is a highly skilled multilingual and forensic clinician certified as a Sex Offender Treatment Provider with the Virginia Board of Psychology. He obtained his education through a Master’s in Social Work from the University of Puerto Rico, Rio Piedras Campus and a Bachelor’s of Arts in Human Services from Université d’Etat d’Haïti. Mr. Constant also completed a postmaster’s certificate in clinical supervision at The University of Connecticut School of Social Work. He carries a solid background providing behavioral health services stemming from his education and a variety of practice settings and areas of intervention. His expertise and scope of practice include psychosexual and re-offense risk assessment, sex offender treatment and relapse prevention services to both juvenile and adults, mental health evaluation, psychotherapy and emotional hardship reports on clients experiencing acute life stressors. Mr. Constant offers behavior health treatment services in Creole, French, Spanish and English. Ms. Constant trained in trauma-informed care and he adheres to the CBT premises, showing a close connection between thoughts feelings and behaviors. He values reality/choice therapy, stressing self-evaluation and personal commitment to changes and promotes healing from trauma by encouraging grounding, safety and self-efficacy.

Mr. Constant favorite activities include traveling, watching nice movies, reading, and listening to music (jazz, blues and classical).


Patricia Crosby, LPC MEd
Behavioral Health Consultant

Ms. Crosby is a native from Peru. She graduated with honors as a Licensed Clinical Psychologist at the Ricardo Palma University, Lima, Peru in 1996. She immigrated to the United States in 2001 and started working with at-risk youth, providing intensive counseling services for over 10 years. She obtained a Master’s degree in Counseling / Community Agency track at George Mason University, Fairfax VA in 2012. Ms. Crosby has been working in private practice since 2013 obtaining her License Professional Counselor (LPC) in 2016. Native Spanish speaker.

Ms. Crosby provides individual and couples counseling to clients dealing with: acculturation issues, anger problems, anxiety, depression, academic problems, lack of social skills, interpersonal challenges, ADHD, parenting, divorce, and Psycho- education among others.

Nancy Crespo-Richardson-bio

Nancy Crespo-Richardson, LMHC-E
Behavioral Health Consultant

Nancy Crespo-Richardson is a Bilingual Behavioral Health Consultant. Licensed Mental Health Counselor in the State of Hawaii and a current Professional Counseling Resident for the State of Virginia. Nancy obtained her Masters in Counseling from Texas A & M – Central Texas, and her Bachelors in Behavioral Sciences and Ethnic Studies Minor from California State University, San Bernardino. She has experience working with adults, service members and their families, veterans, adult children caring for elderly parents, and 65+ community.

On her free time Ms. Crespo-Richardson enjoys reading, yoga, running, listening to music and attending the live arts.