Meet Our Clinical Staff


Shannon D. Mullen, Ph.D., CSAT-S

Shannon D. Mullen completed her Ph.D. in Counseling Psychology from The University of Tennessee in Knoxville, Tennessee, in 2008. She is a licensed psychologist in the states of Georgia and Florida and a PSYPACT clinician. Before her doctoral studies, Dr. Mullen completed a Master of Arts in Counseling at the University of New Orleans. Dr. Mullen established Mosaic Psychological Services in 2010, where she provides clinical and forensic services. Clinical areas of specialty include trauma, attachment, sexual health/addictions, and psychological evaluation. Additionally, as a Certified Sexual Addiction Therapist, Supervisor, she provides targeted interventions for individuals struggling with sexual infidelity and addiction to sexual material and behaviors. Patients are guided through the recovery process through specialized interventions to initiate and sustain long-term recovery and restore relationships broken by betrayal trauma. Dr. Mullen has nearly 20 years of treatment and assessment experience in sexual disorders and addiction. Treating the whole person is a hallmark of her work, and she approaches each person with attention to the physical, emotional, and spiritual dimensions of their personhood. Dr. Mullen is trained in psychodynamic theory and currently practices through a trauma model utilizing Internal Family Systems. She is also EMDR trained. Finally, as a Catholic Christian, theology is a welcomed addition to this clinical work and forms the psychodynamic lens through which the whole person is restored to dignity and health. Dr. Mullen is also a regular speaker and consultant for religious organizations. She designs and hosts training seminars for clinicians in psychosexual assessment and treatment of clergy and clergy applicants. When not engaged in direct patient care and training, Dr. Mullen enjoys supervising emerging new mental health professionals. Georgia License PSY003406 & Florida License PY10361

Mandy B. Mullen, MSW, LCSW, CPTT

Mandy B. Mullen is a Licensed Clinical Social Worker in Georgia, Florida, and Alabama. Ms. Mullen received a B.S. in Human Services and has a Master of Social Work from Florida Gulf Coast University in Fort Myers, Florida. Her current professional specialties are betrayal trauma, play therapy, trauma counseling, child and adolescent behavioral problems, marital therapy, and relationship counseling. Ms. Mullen is a Certified Partner Trauma Therapist (CPTT) working with the partners of sex addicts and their experience of betrayal trauma. She is also certified in Trauma-Focused Cognitive Behavioral Therapy (TF-CBT), EMDR, and Internal Family Systems treatment level one. Ms. Mullen is the System of Care Director and ensures the best patient experience for receiving services at Mosaic. Georgia License CSW004523 Florida License SW10187 & Alabama 5030C

David Valpuesta, LMFT

David Valpuesta received his Master's of Science in Marriage and Family Therapy from Valdosta State University. Prior to obtaining his Master's degree, Mr. Valpuesta received his Bachelor of Science in Psychology from Florida State University. As a Marriage and Family Therapist, he understands that when people experience trauma or severe stressors, life may seem to unravel. It is his passion to help couples, families, and individuals experiencing martial or relational conflicts, adolescent behavioral problems, and bereavement issues. He is certified in Anger Management and currently certified as a level 1 in TEAM- CBT. Georgia License MFT001440

Rachelle H. Cantin, Ph.D., NCSP

Rachelle Cantin, Ph.D. is a licensed psychologist in the state of Georgia and a Nationally Certified School Psychologist (NCSP). Dr. Cantin obtained her undergraduate degree at Albion College, where she graduated with honors. Dr. Cantin received her Ph.D. in School Psychology from Illinois State University. While at Illinois State, Dr. Cantin was bestowed the Ora Bretall Graduate Fellowship and University Fellowship. She concluded her doctoral studies with a clinical internship at the APA-approved Florida State University Multidisciplinary Center (FSU MDC). Dr. Cantin has completed specialized training in autism spectrum disorder (ASD), anxiety, trauma, and neuropsychological assessment. She has extensive experience in the evaluation and treatment of developmental, educational, and behavioral disorders among child and adolescent populations. Dr. Cantin holds additional certifications as both a Certified Clinical Telemental Health Provider (CTMH) and a Certified Clinical Anxiety Treatment Professional (CCATP). Georgia License PSY003823 & Florida License PY10943

Carrie Milhous, LPC

Carrie Milhous believes that psychotherapy is a process of healing and of discovery that leads to an awareness of who you are and who you were created to be. Her clinical experiences include working with adolescents and adults who live with ADHD, anxiety, or affective disorders, assisting parents in developing successful parenting strategies, marriage preparation, and enhancement, and supporting older adults as they encounter disabilities and caregiving responsibilities. Carrie favors a strength-based approach with a cognitive-behavioral orientation and she is also a trauma-informed therapist who is an EMDRIA approved EMDR therapist. Carrie is a Licensed Professional Counselor in the State of Georgia. She obtained her Master of Arts degree in Counseling at the University of Notre Dame, and a Certificate of Advanced Graduate Studies in Clinical and Community Counseling from Johns Hopkins University. Prior to that, she received her Bachelors of Science in Psychology at Georgia Southern University. Georgia License LPC005462

Megan A. Nichols, Ph.D.

Dr. Nichols is a licensed psychologist in the states of Florida and Georgia. She specializes in the assessment and treatment of children and adolescents, with a particular interest in Autism Spectrum Disorder. She completed her doctoral studies at Florida State University where she received extensive training in assessment, consultation, and intervention across clinic, hospital, school, and university settings. Dr. Nichols earned her B.S. in psychology from the University of Central Florida and was also licensed as a general education and special education teacher in the state of Florida, where she had experience teaching students with Autism Spectrum Disorder in the general education, self-contained, and residential settings. Dr. Nichols joined Mosaic Psychological Services following the completion of an APA-accredited Predoctoral Internship and Postdoctoral residency at the Florida State University Multidisciplinary Evaluation and Consulting Center. Her training primarily emphasized the neurodevelopmental assessment of Autism Spectrum Disorder, attention disorders, internalizing concerns, and learning disorders. She also has experience providing consultation, positive behavior support, and mental health services to students in rural school districts, and parent training. Her professional interests include social skills training, improving social-emotional health, and understanding the effects of technology use on children and adolescents. Georgia License PSY004455 & Florida License PY10693

Maritza Miller, Ph.D.

Maritza Miller is joining Mosaic Psychological Services for her Postdoctoral residency following the completion of an APA-accredited Predoctoral Internship at the Florida State University Multidisciplinary Evaluation and Consulting Center. She completed her doctoral studies at Florida State University, receiving extensive training in assessment, consultation, and intervention across clinics, schools, and university settings. Maritza received her Master of Arts in Forensic Psychology from George Washington University. Prior to obtaining her master's degree, Dr. Miller received her Bachelor of Arts in Psychology from Dartmouth.

Taryn Wade, Ph.D.

Dr. Wade completed her doctoral studies in special education at Florida State University. She is a nationally certified school psychologist (NCSP) and a licensed school psychologist in the state of Florida. Dr. Wade is a board-certified behavior analyst (BCBA). She earned her B.A. in psychology from the University of South Carolina and her M.S./Ed.S in school psychology at Florida State University. Dr. Wade has experience in assessment, consultation, and intervention support with toddlers through post-high school populations in clinical, school, and university settings. Florida License SS1672

Rebecca Clark, PsyD

Rebecca Clark completed her PsyD in Clinical Psychology at Mercer University in Atlanta, Georgia. Dr. Clark joined Mosaic Psychological Services for her Postdoctoral residency following the completion of an APA-accredited Predoctoral Internship at Centerstone Hospital and Community Mental Health Clinic in Florida. She has extensive experience with assessment, consultation, and intervention across clinics, hospitals, schools, and universities. Her training focuses on psychological assessments and therapy covering a wide range of mental health challenges, including trauma, crisis management, depression, obsessive-compulsive disorder, anxiety, learning disorders, personality disorders, emotional and behavioral difficulties, drug and alcohol addiction, grief, developmental delays, social skills deficits, and other related challenges.

Alan Crutchfield, Ph.D.

Alan Crutchfield completed his Ph.D. in counseling psychology at Florida State University and joined Mosaic Psychological Services for his post-doctoral residency. He completed his pre-doctoral internship at the Texas Tech University Student Counseling Center. Dr. Crutchfield has worked in various clinical settings since 2015, including a therapeutic summer camp, multiple university clinics, a K-12 school, inpatient and outpatient hospital settings, and private practice. His training focuses include trauma, addiction (including sex, drugs, alcohol, etc.), recovery from addiction, couple's counseling, attachment, interpersonal dynamics, forensic and psychological evaluations and assessments. His theoretical orientation for therapy is integrative, influenced by client-centered, interpersonal process, and psychodynamic therapies. However, he also integrates expressive arts, narrative therapy, CBT, etc. in the treatment plan depending on what might be most helpful to meet each client where they are. Dr. Crutchfield’s approach facilitates connection, healing, and growth. As a Christian with personal experience in long-term recovery from addiction to drugs and alcohol, Dr. Crutchfield welcomes the integration of spirituality into the biopsychosocial model for client’s who find that approach valuable.

Arizona Chin, Ph.D.

Arizona Chin completed her Ph.D. in Counseling Psychology from Florida State University in Tallahassee. Dr. Chin is joining Mosaic Psychological Services for her Postdoctoral residency after completing her APA-accredited internship at the University of Illinois at Urbana-Champaign. She earned her B.A. in psychology and M.S. in Clinical Mental Health Counseling from Northeastern State University. Dr. Chin uses an integrative approach emphasizing authenticity through humanistic, multicultural, and strengths-based therapy perspectives. Dr. Chin believes both client and therapist come to the session with rich cultural and experiential knowledge that can facilitate the healing process. As our world quickly changes, our need for collaboration, compassion, connection, and meaning-making remains the same. When working with clients, Dr. Chin aims to empower them to live their truth and provide a safe space to explore who they are and who they want to become. Dr. Chin encourages clients to embrace the beauty and complexity of the human condition.

Tyler Wood, M.Ed.

Tyler Wood is in the final semester of his Counseling and School Psychology Ph.D. program at Florida State University and is transitioning into his postdoctoral residency. Tyler completed an APA-accredited predoctoral internship at Florida Gulf Coast University Counseling and Psychological Services. Tyler has experience in community, private practice, school, and university settings. He particularly enjoys working with young adults as they navigate the complexities of newfound independence. Tyler's clinical interests include anxiety and stress, depression, interpersonal relationships, adjustment concerns, identity and self-esteem, substance use, and trauma. Tyler utilizes an integrative approach with interpersonal, cognitive-behavioral, acceptance-based, and internal family systems methodologies. Prior to FSU, he earned a Master of Education in Counseling Psychology at the University of Louisville, following a Bachelor of Arts in Psychology from the University of Kentucky.

Jacqueline Niks, Intern

Jacqueline Niks is completing her Master’s in Clinical Mental Health Counseling from Divine Mercy University. Prior to embarking on a career in counseling, Jacqueline received her Bachelor’s in Choral Music Education from Florida State University and was a teacher for twenty-two years. Her experience includes conducting choirs of all ages, teaching school music classes to preschool through high school-aged students, private piano and voice instruction, group music theater classes, and community youth choirs. She has extensive experience working with immigrant populations and children with special needs. She has been involved with youth ministry for eight years. Jacqueline works with clients of all ages and challenges and is working towards a certification in Traumatology.