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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







Twyla Mancil


Twyla Mancil, Ph.D.

Dr. Twyla L. Mancil obtained her undergraduate degree at Georgia Southern University, where she majored in psychology and graduated with highest honors. Upon receiving her Bachelor of Science degree in Psychology, Dr. Mancil was admitted to the Clinical Psychology Master of Science program at Georgia Southern University, where she completed one year of study before being admitted to the School Psychology doctoral program at the University of Florida in 2006 with an Alumni Fellowship. Dr. Mancil completed her doctoral clinical internship at the APA-approved Florida State University Multidisciplinary Center in Tallahassee, FL and received her Doctor of Philosophy degree from the University of Florida in August 2012. She subsequently completed her postdoctoral fellowship at the Moore Counseling Center in Moore, OK, with a primary focuson the assessment and treatment of autism spectrum disorders. Dr. Mancil has clinical and research experience in the assessment and treatment of developmental and behavioral disorders among child and adolescent populations, with additional specialization in early childhood assessment and intervention and educational consultation.




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.   





Kim King Hayes



Kimberly King Hayes

Office Administrator








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!"