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Our Providers

A multidisciplinary practice offering adult psychiatry, child psychiatry, 

clinical psychology and family counseling

Marsh Landing Behavioral Group evolved from Dr. Mark Tomaski's solo child psychiatry practice on Third Street South in Jacksonville Beach. Dr.Tomaski opened this practice in 1996 while practicing as the first child psychiatrist at Nemours Clinic, and consulting for Wolfsons Children's Hospital Psychiatry Unit and Jacksonville's community mental health care system.


With recognition that Northeast Florida offered only fragmented mental health care, he began developing a private group practice to provide comprehensive care to children and families. Marsh Landing Behavioral Group is now an established multidisciplinary practice integrating classic treatment concepts and the modern neurosciences.


Marsh Landing Behavioral Group Specialists provide adult psychiatry, child psychiatry, clinical psychology, and family counseling.


Our providers have a wide range of experience and specialty knowledge in many areas.


Medical Evaluation and Treatment
Mark Christopher Tomaski, M.D.

Dr. Tomaski is the founder and medical director at Marsh Landing Behavioral Group.  He specializes in treating children and adolescents.  Along with many years of education and practice he attributes much of his understanding of childhood mental health to his intensive training at Tampa General Hospital in pediatrics as well as psychiatry.  He has been recognized as Resident of the Year, Chief Resident, awarded special recognition from Mayo Clinic residents for teaching as Nemours first child psychiatrist. Dr. Tomaski is a member of AACAP as well as Phi Theta Kappa and Phi Kappa Phi national honor societies.


  • Child, Adolescent, Adult Psychiatrist

  • Child psychiatry fellowship University of South Florida

  • Adult psychiatry residency University of South Florida

  • Pediatric internship University of South Florida

  • M.D. University of South Carolina School of Medicine

  • Undergraduate degree Jacksonville University

Alisia Martin, M.D.
Alisia Martin, M.D.

Dr. Martin is board-certified in psychiatry and child/adolescent psychiatry. Dr. Martin specializes in treating children, adolescents and young adults.  She is a member of AACAP.


  • Child, Adolescent, Adult Psychiatrist

  • Child psychiatry fellowship University of Florida

  • Adult psychiatry residency University of Florida

  • M.D. University of Florida

  • Undergraduate Degree Howard University

Yuliet Sanchez, M.D.
Therapy, Counseling and Testing
Yuliet Sanchez-Rivero, M.D.

Dr. Sanchez-Rivero joined Marsh Landing Behavioral Group in August of 2017. She is Board Certified in Psychiatry and Neurology and is a member of AACAP. She has a passion for helping children and families improve their quality of life. She enjoys traveling, cooking, and spending time with loved ones.


  • Child Psychiatry fellowship: University of Florida

  • Adult Psychiatry residency: University of Florida

  • M.D. University of Puerto Rico

  • Magna Cum Laude Undergraduate Degree University of Puerto Rico

Cynthia Stevens, Ph.D
Cynthia Porter Stevens, Ph.D.

Dr. Stevens specializes in cognitive behavioral therapy for anxiety disorders and obsessive-compulsive disorders (OCD), and offers spiritually integrated treatment (Christian nondenominational). She has practiced at Marsh Landing Behavioral Group since 2000.


  • Licensed Psychologist

  • Ph.D. Psychology University of Memphis, specializing in child and pediatric neuropsychology

  • B.A. Psychology (biology minor) Southern Methodist University

  • Published in the area of early brain injury effects on subsequent childhood development

Mark Tomaski, M.D.
Jennifer Wolford, Psy.D
Jennifer Lynn Wolford, Psy.D.

Dr. Wolford works with children, adolescents and families. She specializes in depression, anxiety, social phobia, grief, post-abortion issues and abuse.  She employs an eclectic mix of cognitive behavioral therapy and child-centered family systems.  She specializes in cognitive, achievement, attention, personality, emotional, behavioral, developmental, visual-motor, vocational, and school testing. 


  • Licensed Psychologist

  • Psy.D. Clinical Counseling Regent University

  • B.S. University of Florida

  • Internship Milton Hershey School

  • Post-doctoral training Clinical Health Psychology Private Practice

Scott Greenaway, Ph.d., ABPP
Scott Greenaway, Ph.D., ABPP 

Dr. Greenaway works with adults and children, specializing in threse primary areas:

      Cognitive-Behavioral Therapy for ADHD, depression, and anxiety (including phobias and OCD).

      Working with parents and their children displaying oppositional or explosive behavior.

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  • Licensed Psychologist

  • Board Certified (American Board of Professional Psychology)

  • Ph.D. Clinical Psychology University of Texas Southwestern Medical Center (Dallas)

  • M.A. Clinical Psychology Antioch University (Los Angeles)

  • B.S. Education Pennsylvania State University 

  • APA-approved certification in CBT from The Atlanta Center for Cognitive Therapy

  • APA-approved certification in assessing autism spectrum disorder

Janet Campbell, M.A., L.M.H.C
Janet Campbell, M.A., L.M.H.C.

Janet has been a Licensed Mental Health Counselor since 1996. She has been a part of Marsh Landing Behavioral Group since 2001. She specializes in child, adolescent and family therapy for grief, divorce/separation, adjustment disorders, anxiety, autistic spectrum disorders, women’s issues, depression and attention deficit disorder.


  • Licensed Mental Health Counselor (LMHC)

  • M.A. Counseling Psychology University of North Florida

  • Undergraduate degree University of North Florida

Annmarie Powell, M.S.W., L.C.S.W
Annmarie Powell, M.S.W., L.C.S.W.

Annmarie specializes in cognitive behavioral therapy for adults with depression, anxiety, grief, trauma and adjustment problems. Experienced in counseling patients and caregivers coping with chronic or terminal illness; familiar with hospice setting. Ms. Powell has 16+ years’ professional experience in the local healthcare community, including supervision of graduate M.S.W students completing internships.  Return to top of page


  • Licensed Clinical Social Worker (LCSW)

  • M.S.W. Florida State University

  • B.S.W. Florida State University

  • Internship Community Hospice of Northeast Florida

  • Clinical Supervision at Mayo Clinic, Florida

Tiffany Wood M.S., L.M.H.C
Tiffany Wood, M.S., L.M.H.C.

Tiffany coaches and counsels teens, college students and young adults using an Acceptance and Commitment Therapy framework. She treats depression, anxiety, ADHD and adjustment issues through a strengths-based approach, helping clients process and manage difficult thoughts and feelings while choosing and engaging in actions that lead toward their values and goals. She offers spiritually-integrated counseling for those who would like to incorporate their Christian faith and spiritual practices in treatment. 

  • Licensed Mental Health Counselor (LMHC)

  • M.S., Clinical Mental Health Counseling, University of North Florida

  • B.A., Psychology, Georgia Southern University

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