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Dr. Sheehan completed his undergraduate training at The Georgia Institute of Technology in Atlanta, Georgia in 1984 with a Bachelor's Degree in Industrial Engineering with Highest Honors. He then completed medical school at the University of Alabama School of Medicine in Birmingham, Alabama in 1988. He served his internship and residency at the University of Alabama at Birmingham Hospital from 1988 to 1991 prior to completing his Fellowship in Child and Adolescent Psychiatry at Emory University School of Medicine in Atlanta, Georgia in 1993. He served on the medical staff at North Mississippi Medical Center in Tupelo, Mississippi from 1993-2000 as the Medical Director of the Adolescent Psychiatry Unit. He has been Board Certified in both Child & Adolescent Psychiatry and Adult Psychiatry since 1994. He has medical licenses in the states of Mississippi, Alabama, and Georgia.

Areas of interest include:

  • Depressive Disorders

  • Anxiety Disorders

  • Bipolar Disorder


  • Childhood Behavioral Problems

  • Panic Disorder

  • Obsessive Compulsive Disorder

  • Psychotic Disorders

Dr. Sheehan's initial assessment typically lasts 45-60 minutes. At this time, he will complete a thorough evaluation of all your mental health symptoms and your background history. At the end of this assessment, Dr. Sheehan will explain your diagnosis with a tailor-made treatment plan including medications, possible bloodwork and other testing as indicated, and referral to the most appropriate counselor to fit your needs. Subsequent visits are typically scheduled monthly, last approximately 15 minutes, and are oriented towards adjusting your medication to help you or your child achieve an optimal response  so you will feel and function your very best.

Clyde A. Sheehan, M.D.

Child, Adolescent and Adult Psychiatrist

Our Team 

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Summer Jennings, MSN, PMHNP-BC

​Child, Adolescent, & Adult

Mental Health Nurse Practitioner 

Summer is a board-certified psychiatric nurse practitioner. She is qualified to diagnose, treat, and prescribe medications to children, adolescents, and adults. Her specialties allow her to address an array of mental health issues across the lifespan.

After completing her Associate Degree in Nursing at Northeast MS Community College in 2012, she worked as a registered psychiatric nurse. Understanding mental illness to be her passion, she decided to further her education at the Mississippi University for Women in Columbus, Mississippi and received her Baccalaureate in nursing. Following her time at MUW, she attended Walden University while maintaining a 4.0 GPA, she earned her master’s degree in nursing with a specialty of Primary Mental Health Nurse practitioner. She is a member of the American Psychiatric Nurse’s Association and an active alumni member at the Mississippi University for Women.

Summer is a lifelong resident of North Mississippi and looks forward to serving you and your families. She believes in a holistic approach that addresses the whole person and not just their mental health needs. Summer strives to provide her patients with individualized care in a safe, nonjudgmental environment.  


Areas of Interest:

  • Depressive Disorders                

  • Anxiety Disorders                       

  • Mood Disorders

  • Psychotic Disorders     



Lisa completed her Master of Science Degree from the Department of Counselor Education & Educational Psychology at Mississippi State University in 1993. She completed post-graduate course work at both the University of Memphis and the University of Tennessee in Memphis. She has been a Licensed Professional Counselor in the state of Mississippi since 1997. She has been a National Certified Counselor though the National Board for Certified Counselors since 1995. She is a member of the Mississippi Counseling Association. She has worked as a therapist in both private and non profit settings for over 20 years. She has also presented at State conferences and to general audiences speaking on the value of Animal Assisted Therapies.

Lisa provides individual psychotherapy (generally aged 14 & up) and marriage/ family counseling. Her areas of practice and special interest include:

  • Mood Disorders (Depression, Bipolar)

  • Anxiety Disorders (PTSD, OCD, Panic, Generalized)

  • Grief & Loss Counseling

  • Life Transitions (adjustments to changes)

  • Stress Management

  • Women's Issues- Abortion recovery, PMDD, Infertility

  • Self-esteem Issues

  • Sexual Trauma

  • Crisis Intervention

  • Marital issues

  • Adolescent Development

  • Critical Incident Stress Debriefings

  • Animal Assisted Therapies

Lisa's primary therapeutic orientation is based on cognitive- behavioral principles; however, she tailors her approach to meet the needs of each individual, while capitalizing on their strengths. Lisa strives to develop a therapeutic relationship with her clients that encourages exploration, insight, and growth to provide them with the skills and confidence they need to improve the quality of their lives.

Lisa Abstein, MS, NCC, LPC


Sheehan Counseling Center, P.A.

1040B S. Madison Street

Tupelo, MS 38801

Call Us: 662-844-4364

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