About Grapevine Psychology

Anna has been dedicated to providing compassionate and evidence-based mental health care as a Licensed Clinical Social Worker. Her expertise lies in working with individuals who have experienced complex trauma, intimate partner violence, relationship concerns, anxiety, depression, PTSD, and attachment trauma.
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As a Spanish-speaking therapist, Anna understands the importance of delivering culturally responsive care. She is passionate about serving diverse communities and recognizes how a multicultural perspective enhances the therapeutic experience. Anna's approach is client-centered, trauma-informed, and tailored to each individual’s unique needs, fostering healing and resilience.
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She strives to create a safe, supportive space where clients feel heard, understood, and empowered on their journey toward emotional well-being.

Dr. Abigail Powell is a Licensed Psychologist with Provisional Status who recently transitioned back to her home state of Texas after several years in Virginia. She is excited to be part of the Grapevine Psychology team, where she provides therapy services to women navigating the perinatal and postpartum periods, life transitions, and the challenges of parenting. Dr. Powell also has a deep commitment to supporting the military community, particularly those within Special Operations.

Dr. Powell earned her Bachelor’s degree in Psychology with a focus in Military Studies from Texas A&M University. She went on to complete her Master's and Ph.D. in Clinical Psychology at Saybrook University.

With a passion for mental health that began at the age of fifteen, Dr. Powell has spent years building strong, therapeutic relationships with her clients. She believes in empowering individuals to reach their full potential by using evidence-based practices and fostering a supportive environment where clients feel confident advocating for their needs. Dr. Powell is committed to helping her clients grow into the best versions of themselves while working towards their personal goals and increasing resiliency.

Outside of her professional life, Dr. Powell is known as "Dr. Mom" to her children, which is heavily encouraged by her husband. She is a strong advocate for experiential learning, often taking her family on “homeschool” field trips that connect learning with real-world experiences. When it comes to health and wellness, Dr. Powell embraces a balanced lifestyle—one that includes learning new habits without having to sacrifice the joy of pizza or pasta.

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.

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.

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!

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.