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Our Staff

Shannon D. Mullen, Ph.D





Shannon D. Mullen, Ph.D.

Shannon D. Mullen completed her Ph.D. in Psychology from The University of Tennessee in Knoxville, Tennessee.  Dr. Mullen is  a licensed psychologist in the state of Georgia.  Prior to her doctoral studies, Dr. Mullen completed a Master of Arts in Counseling at the University of New Orleans.  Dr. Mullen established Mosaic Psychological Services where she provides clinical and forensic services.





Mandy B. Mullen, LCSW








 Mandy B. Mullen, LCSW

Mandy B. Mullen is a Licensed Clinical Social Worker in both Georgia and Florida.  Ms. Mullen received a B.S. in Human Services and has a Masters of Social Work from Florida Gulf Coast University in Fort Myers, Florida.  Her current professional specialities are play therapy, trauma counseling, child and adolescent behavioral problems as well as marital therapy and relationship counseling.  Ms. Mullen is also certified in Trauma Focused Cognitive Behavioral Therapy (TF-CBT).  Ms. Mullen is also the System of Care Director and is responsible for ensuring the best patient experience for receiving services at Mosaic.





Destin Stewart Richardson, Ph.D





Destin N. Stewart, Ph.D.

Destin Stewart-Richardson completed her Ph.D in Psychology from the University of Tennessee in Knoxville, Tennessee. Dr. Stewart is a licensed Psychologist in Georgia.  Her professional interests include women's mental health, substance abuse, sexual addiction, psychological, neuropsychology, and psychoeducational assessment, trauma, forensics, and group therapy. Prior to her doctoral studies, she completed a master's degree in Psychology from Mississippi State University. Dr. Stewart has held clinical placements at university counseling centers, hospitals, and outpatient clinics. She completed a pre-doctoral clinical internship at the University of Florida Counseling and Wellness Center





David Valpuesta



David Valpuesta, MFT

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.   





 Rachelle Cantin, Ph.D




Rachelle H. Cantin, Ph.D., NCSP

Dr. Cantin obtained her undergraduate degree at Albion College, where she majored in psychology and graduated with honors. Dr. Cantin received her Ph.D. in School Psychology from Illinois State University’s.  While at Illinois State, Dr. Cantin was bestowed the Ora Bretall Graduate Fellowship and University Fellowship.   She completed specialized training in neuropsychological assessment, with an emphasis on executive functioning.  Dr. Cantin concluded her doctoral studies with a clinical internship at the APA-approved Florida State University Multidisciplinary Center in Tallahassee, FL. She subsequently completed her postdoctoral fellowship at Georgia Pediatric Psychology in Atlanta, GA, with a primary focus on the assessment and treatment of Autism Spectrum Disorder. She has extensive experience in the assessment and treatment of developmental, educational, and behavioral disorders among child and adolescent populations, with an additional specialization in Autism Spectrum Disorder, intervention, and educational consultation. 



Martha Walter, Ph.D.



Martha J. Walter, Ph.D


Dr. Walter obtained her Ph.D. in School Psychology from the University of Wisconsin-Madison. Prior to finishing her Ph.D., she completed her doctoral clinical internship at the Florida State University Multidisciplinary Evaluation and Consulting Center in Tallahassee, FL. She subsequently completed her postdoctoral fellowship in the Developmental Medicine Center at Boston Children's Hospital/Harvard Medical School in Boston, MA. Dr. Walter has extensive clinical experience in the assessment and treatment of children, adolescents, and young adults with a range of social-emotional, behavioral, and academic difficulties. She has particular expertise in assessment of Autism Spectrum Disorder, Intellectual Disabilities, Learning Disabilities, and ADHD; early childhood assessment; intervention for Selective Mutism and other Anxiety Disorders; and school consultation.




Mosaic Psychological





Alexis Odom

Billing and Credentialing Specialist







Linda Best




Linda Best

Administrative Assistant








Lara Newborn






Lara Newborn

 Intake Coordinator










Candace Strickland, BS

Testing Coordinator













Cassie, Therapy Dog

Cassie is a 10 year old, German Shephard.  She has been specifically trained as a therapy dog and attends some sessions as needed.  Cassie is loved by all the children who visit the office! When you come to the office Cassie might bark to say, "hello!"