About Grapevine Psychology

Willie D Bass specializes in working with adolescents, young adults, and couples. He values the development of a solid therapeutic relationship and prioritizes the safety and authenticity of his clients to ensure they feel comfortable reflecting, gaining insight, and self-exploring.

Mr. Bass primarily uses a cognitive-behavioral therapy (CBT) approach but has experience using psychodynamic, interpersonal, and solution-focused theories to treat various concerns, including anxiety, depression, identity issues, adjustment, family/social concerns, and trauma.

Mr. Bass is a therapist-in-training, who is currently completing his doctorate in psychology (PsyD) in Clinical Psychology from The Chicago School and is under the supervision of Dr. Kari Leavell while providing services at Grapevine Psychology.

Accepting New Clients for in-person and Telehealth

Willie is pre-licensed and accepts clients with Cigna and Aetna plans, under the direct supervision of Dr. Kari Leavell, Licensed Psychologist.

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Clients Treated

• - Adults
• - Couples

Specialty Areas

Meet Mr. Bass

Payment Accepted

• --- Self-Pay: $50/individual session
• - - Open Path
• - - Discounted (Non-insurance) rate available

- Life transitions  
- Anxiety
- Depression  
- Relationship concerns

Meghan is a LPC who received her Bachelor's in Psychology from New College of Florida, and continued on to receive her master's in Marriage, Couples, and Family Therapy from UCF in Florida.
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‍Meghan has considerable experience working with individuals in overcoming a variety of issues, including recovery from trauma and C-PTSD, anxiety, depression, and substance use. Meghan uses creative and evidence-based strategies to aid clients in gaining insight into their thinking and actions, and make adjustments to live more authentic, connected, and fulfilled lives.

Outside of being a therapist Meghan loves dance, tea, and spicy food.

Accepting New Clients
Telehealth Only Appointments

Insurance Accepted

Clients Treated
- Teens 14+
- Adults


Specialty Areas
- Anxiety  
- Depression
- Trauma  
- Substance Use

Self-Pay Accepted

DeLisa Deutsch Perry, MS, a Licensed Professional Counselor-Supervisor and a Certified Eating Disorder Specialist (by the International Association of Eating Disorders Professionals-IAEDP). She has over 15 years of experience working with eating disorders and related issues (including body acceptance, exercise addiction) and co-occurring conditions such as anxiety and depression.

DeLisa practices evidenced based therapies, such as Cognitive Behavioral Therapy (CBT), Dialectal Behavior Therapy (DBT), Interpersonal Therapy (IPT), as well as systems approaches, and other appropriate interventions. She enjoys working with populations that are often under-treated for eating disorders, such as BIPOC communities and LGBTQIA+ populations.

DeLisa graduated from Stephen F Austin State University with a Bachelor of Arts in Psychology in 1995, and went on to complete a Master of Science in Counseling Psychology in 1999 at the University of North Texas in Denton, Texas with a focus on Marriage and Family Counseling.

Accepting New Clients
Telehealth Only Appointments

Insurance Accepted

Clients Treated

 - Teens 13+
 - Adults

Specialty Area
 - Eating Disorders

Licensed to provide services in:
- Texas
- California

Self-Pay Accepted

Dr. Slack joined Grapevine Psychology from Texas Woman's University where he earned his Master’s and Ph.D. in Counseling Psychology.

Dr. Slack has considerable experience working with survivors of trauma, young adults, LGBTQ+ identity development, and issues with anxiety and depression. Dr. Slack's professional interests include Ally and activist identity development, intimate partner violence, trauma recovery, addiction/substance abuse recovery, feminist therapy approaches, and liberation psychology.

Outside of his role as a psychologist, Dr. Slack enjoys the outdoors, strength training, fostering animals from the shelter, and spending time with his four cats (Forest, Finn, Axel, and Luna) and his dog, Wheezy!

Accepting New Clients

Insurance Accepted

Clients Treated

Self-Pay Accepted

Specialty Areas
  - LGBTQ+ Identity Development
  - Anxiety
  - Trauma
  - Depression

Meet Dr. Slack

  - Teens 16+
  - Adults

Dr. Kari Leavell is a licensed psychologist and the owner of Grapevine Psychology.  She manages the day-to-day operations of the practice, overseeing patient care, and ensuring the provision of high-quality, evidence-based mental health care.  

Dr. Leavell provides professional consultation, custom Wellness Programs for small businesses, and clinical supervision. She earned her Bachelor’s degree in Psychology at Texas A&M University, and completed her Master’s and Ph.D. in Counseling Psychology at the University of Southern Mississippi.

Dr. Leavell obtained a postdoctoral Master of Science in Clinical Psychopharmacology in August 2023 from Alliant International University, and will pioneer as a prescribing psychologist when legislation allows.  Dr. Leavell’s special interests include the science and psychology of sleep, the neurology of mental health, and prescriptive authority for properly trained psychologists.

Dr. Leavell has been an active member of the Texas Psychological Association (TPA), including participating in multiple committees, serving on the Board of Trustees, and being elected to the role of TPA president for 2026.

Outside of her professional roles, Dr. Leavell takes care of herself by seeking time outside through walking her dog, hiking, and tending to rose cuttings from her grandmother’s garden.  She deems chips and queso to be health food, and enjoys reading historical fiction.

Meredith joined Dr. Leavell in 2017 as the Office Manager, and has been part of the development of Grapevine Psychology.

She works remotely from her home office near San Antonio and handles administrative tasks for the practice. She graduated from Texas A&M University in 2007 and has been moving around the country with her military family since 2011.