About Us: Extraordinary, Life-Changing Care


What Makes Greenhouse Truly Unique

  • A True Getaway in a Luxurious Spa-Like Environment
  • Passionate Staff Made Up of the Best in the Addiction Treatment Industry
  • Genetic Testing & Treatment Plans Tailor-Made for You
  • Specialty Programs You Won’t Find Elsewhere
  • Executive Chef-Prepared Meals
  • Here for You at Every Step, from Detox to Sober Living

About Greenhouse Treatment Center

Greenhouse Treatment Center Inside

Greenhouse Treatment Center is the perfect place to leave your past behind and find the joy that recovery can bring. Part of the American Addiction Centers (AAC) family of facilities through the United States, we provide care for addiction and co-occurring disorders with the help of a team comprised of the most dedicated and passionate providers you’ll find.

Located in a former Neiman Marcus spa, Greenhouse isn’t your average addiction treatment facility. We offer a wealth of holistic therapies (such as yoga, meditation, and expressive therapy groups), as well as amenities including indoor and outdoor pools and nutritious, mouth-watering meals that will have you feeling better than ever. Come and experience all that Greenhouse has to offer and get a glimpse into what recovery has in store for you.

90-Day Promise

We stand by our ability to help you or your loved one recover from addiction so much that we offer a 90-day promise. If you complete 90 days of consecutive treatment at Greenhouse and then suffer a relapse, you can return to an American Addiction Centers facility for a complimentary 30 days of treatment.**

**Terms and conditions may apply, and results may vary. Learn more.

Award-Winning Care

At Greenhouse, our commitment to our patients is seen not only in every interaction between staff and patient but in the quality of our facilities and the expertise of our providers. This is why we are a trusted name in the addiction treatment industry. View our industry achievements and accreditations here.

Care Designed Exclusively for You

You won’t get a cookie-cutter approach when you come to Greenhouse Treatment Center. We know that no two people’s experiences are the same, and we treat you like the unique individual you are. Not only do we perform genetic testing to determine the right medical treatment for you, we meet with you immediately upon arrival to begin crafting the best plan for your needs. Your treatment team will reassess your plan regularly and make adjustments to your plan as needed. We never stop working to make sure you have the best possible shot at recovery.

Your Family Is Part of Our Care Team

Recovery doesn’t happen in isolation. Support from those that care about you is an enormous part of staying on a positive trajectory. At Greenhouse, we bring your family into the fold as we work together towards your goals.

We help you heal fraught relationships through family therapy and invite your loved ones to come visit you during treatment.

Specialized, Expert Caregivers Working Together

For our team, treatment is more than a job.

Our treatment team is made up of numerous specialists that all work in concert to help you take meaningful steps on your journey to recovery. Our team of case managers, psychiatric providers, therapists, and nurses approach your recovery from many angles, working with you to help you find physical, mental, and emotional wellness. Our collaborative approach allows us to address the full spectrum of your needs so you stay sober long-term.

You can reach out to us at any time at hello@greenhousetreatment.com.

Tyler Harrell, CEO

Tyler Harrell, COO

“I am passionate about applying knowledge and expertise to effect real change in the lives of others. The disease of addiction requires treatment that is complex, nuanced and often counterintuitive.”

In 2018, Tyler Harrell joined Greenhouse Treatment Center as its chief operating officer and transitioned to chief executive officer in late 2019. Tyler has more than 11 years of experience managing and administrating healthcare organizations. He is also a certified licensed professional counselor supervisor and licensed chemical dependency counselor. His clinical background combined with his years of leadership experience have been instrumental in his ability to provide clinical and operational oversight at Greenhouse that is focused on compassionate, quality patient care.

A member of the Texas Association of Addiction Professionals and the American College of Healthcare Executives, Harrell believes in a holistic approach to addiction treatment that involves treating the body and the mind. Harrell treats addiction with cognitive behavioral therapy (CBT), motivational interviewing (MI), and 12-step programming. Harrell’s passion for helping those struggling with the disease of addiction is ingrained in every aspect of his work.

Shahzad Allawala, M.D., Medical Director

Shahzad Allawala

Shahzad Allawala, M.D. is the medical director at Greenhouse Treatment Center. Dr. Allawala is a Diplomate of the American Board of Psychiatry and Neurology and has more than 15 years of experience treating patients with psychiatric and substance abuse issues. He finished his early medical education from his hometown of Karachi, Pakistan and completed his post-graduate training at Nassau University Medical Center in East Meadow, NY.

Dr Allawala has extensive experience in treating dual diagnosed, substance abuse, and mental health clients. After his post-graduate training, he started his carrier in rural areas of Arkansas and then moved to private practice. He has extensive experience treating patients in inpatient, residential, day program, and outpatient settings. Dr. Allawala is Suboxone-certified and has been treating opioid addiction in outpatient settings for over 10 years.

Melitta Basa, Clinical Director

Melitta Basa, Clinical Director

Melitta Basa, MA, EMDR, LCDC, LPC is the clinical director at Greenhouse Treatment Center in Grand Prairie, TX. She is an accomplished mental health counselor with several years’ experience working in addiction, behavioral health, and marriage and family therapy. Basa holds a master’s degree in mental health counseling of psychology from Kutztown University.

Prior to accepting the role of clinical director, Basa served as a clinical therapist and program coordinator at Greenhouse. As Greenhouse Treatment center’s clinical director, Basa ensures that treatment and aftercare plans are well-established to help patients remain in recovery.

Her desire to help those struggling with the disease is born from her own personal connection to addiction. She was impacted by alcoholism early in her life. As an intern in college, she facilitated group therapy and found that it sparked her passion to pursue a career in the treatment industry. Her personal experiences have given her an even greater empathy for patients.

Courtney Messina, Outpatient Clinical Director

Courtney Messina

“Being in this profession is an opportunity to provide hope to someone during what might be their darkest moments, and show them a path for success.”

Courtney Messina, MA, LPC, LCDC, serves as Greenhouse Treatment Center’s outpatient clinical director. Prior to joining Greenhouse Treatment Center, Messina worked with patients struggling with mental health conditions and/or intellectual and developmental disabilities. Messina has also worked with adolescents and adults who have co-occurring substance use and mental heath conditions, and as a counselor treating patients in the criminal justice system.

When not treating patients, Messina is an avid sports fan. In her free time, she enjoys traveling, working out, and her English bulldog.

Staying Connected in Recovery

The support you receive at Greenhouse Treatment Center doesn’t end when you leave. Our alumni program keeps you connected to a group of people committed to recovery. As part of our alumni network, you’ll build a whole new network of sober, like-minded individuals you can lean on and to whom you can support in kind.

**Greenhouse Treatment Center is an American Addiction Centers facility. We do not host any form of advertisement on this website, no funding is generated from any advertising or external sources, and there is no conflict of interest to disclose on this website or the content herein. Our funding is generated by substance abuse treatment services provided at our facilities.