Addiction Psychiatry Fellows

Dr. Rukhsar Ahmed


Dr. Ahmed

Born in Karachi, Pakistan, and raised in New York, Dr. Ahmed pursued her medical education at Shifa College of Medicine in Islamabad, Pakistan, after completing high school in Queens, New York. She joined the psychiatry residency program at Harlem Hospital, in affiliation with Columbia University, serving as a chief resident in her final year of training. Advocating for patients with addiction-related illnesses while navigating immense resource and socioeconomic challenges as their psychiatrist was among her most meaningful work during residency. The opportunity to further study and train in this branch of psychiatry led her to Dallas.

Dr. Sukhmeet Bedi


Dr. Bedi

Born in Toronto, Canada, and raised in its suburbs, Dr. Bedi received his medical degree from Windsor University School of Medicine in St. Kitts and Nevis. He completed psychiatry residency at Griffin Memorial Hospital in Norman, Oklahoma. During residency training, he had the opportunity to work with many patients with dual diagnoses of mental health and substance use disorders. Being part of their recovery was one of the most inspiring aspects of his residency training. Outside work, Dr. Bedi enjoys learning about different cultures and historical events that have shaped the world today. He is also a supporter of Toronto sports teams, especially the Toronto Blue Jays.

Dr. Jason Seymour


Dr. Seymour

Born in Kingston, Jamaica, and raised in Fort Lauderdale, Florida, Dr. Seymour completed undergrad at Nova Southeastern University and medical school at Saint Georges University in Grenada, West Indies. Dr. Seymour completed psychiatry residency in Cincinnati, Ohio, at the University of Cincinnati. His attraction to addiction Psychiatry came before medical school wihile working directly with the substance use population and volunteering in community harm reduction programs.

Dr. Juan Sosa


Dr. Sosa

Dr. Sosa grew up between Mexico and Texas. He received his undergraduate degree from the University of Texas at Dallas. He received his medical degree with a focus in community health and attended the general psychiatry residency program at the University of Texas Southwestern Medical Center. After residency he moved to Denver to pursue a Forensic Psychiatry Fellowship at the University of Colorado Anschutz Medical Campus. As a longtime Texan, he is excited to be returning to the Dallas area after spending a year in Colorado. Dr. Sosa has a strong interest in correctional psychiatry and the treatment of substance use disorders in correctional settings. At the completion of the addiction fellowship program, Dr. Sosa plans to pursue a career in public and correctional psychiatry, where he hopes to innovate and develop dual-diagnosis programs for individuals involved in the criminal justice system. In his spare time, Dr. Sosa enjoys volunteering in non-profit organizations, spending time with his family, and traveling.

Dr. Maria Velasco


Dr. Velasco

Born and raised in Guayaquil, a busy coastal city in Ecuador, Dr. Velasco earned her medical degree from the Catholic University of Guayaquil. She completed psychiatry residency training at Texas Tech University of El Paso. Her interests are addiction treatment in the acute hospital setting and the intersection of reproductive psychiatry and substance use disorders.

Previous Fellows

Addiction Psychiatry Fellowship 2022 Graduation


Mark Laty, M.D.

Dr. Laty practices in Virginia.


Maureen Onuaguluchi, M.D.

Dr. Onuaguluchi completed the Addiction Psychiatry Fellowship Program.


Hisham Ibrahim, M.D.

Dr. Ibrahim is Associate Vice President and Chief Medical Officer for Ambulatory Services at UT Southwestern.

Sidarth Wakhlu, M.D.

Dr. Wakhlu is the Associate Chief of the Addiction Division and the Addiction Psychiatry Fellowship Director for the Department of Psychiatry at UT Southwestern.


Muneeza Hayee, M.D.

Dr. Hayee works at the Bonham VA residential treatment program.


Arvind G. Singh, M.D.

Dr. Singh is in practice at Prince County Hospital, Summerside, Prince Edward, Canada.

Christopher Lord, M.D.

Dr. Lord has a thriving clinical practice in Charlotte, NC, where he regularly consults with the McLeod Addictive Disease Center and the Dilworth Center for Chemical Dependency and serves as a forensic consultant.


Glenn M. Horwitz, M.D.

Dr Horwitz is in private practice in Hoffman Estates, Illinois.


John Christian Cather, M.D.

Dr. Cather has a psychiatric practice in Dallas, Texas.


Anthony Mazzarulli, M.D.

Dr. Mazzarulli practices at Green Oaks Behavioral Healthcare in Dallas, conducts research at the University of North Texas, and teaches Behavioral Science for the USMLE for Falcon Physician Reviews.


Soo Young Chong, M.D.

Dr. Chong practices at the University of Texas Medical Branch in Galveston, TX.

Padmaja Puppala, M.D.

Dr. Puppala worked on the Addiction Team at the Dallas Veterans Affairs Medical Center and is now at Central Texas Healthcare System.


Phil Chung, M.D.

Dr. Chung is an outpatient Addiction Psychiatrist for the Puget Sound VA Health Care System.

Julie (Ross) Pittman, M.D., Ph.D.

Dr. Pittman is the medical director for Nexus Recovery Center and part of the UT Southwestern Addiction Psychiatry Fellowship Faculty.


Xingchun Tang, M.D.

Dr. Tang is a staff psychiatrist at the Austin VA Community Based Outreach Clinic.


Julie Brown, M.D.

Dr. Brown is a staff psychiatrist at an outpatient clinic for veterans in Oregon.

Nathan Carter, D.O.

Dr. Carter has held many different professional roles since graduating from the fellowship.


Spencer Lee, M.D.

Dr. Lee is in private practice and is an Adjunct Faculty Member at UT Southwestern Medical School.

Jin Li, D.O.

Dr. Li is a staff psychiatrist at Michael E. DeBakey VA Medical Center in Houston, TX.


Yusra Benhalim, M.D.

Dr. Benhalim works as a medical director for Optum.

Nicholas Piotrowski, M.D.

Dr. Piotrowski is Medical Director of Addictions at Wabash Valley Alliance.

Qingman Ruan, M.D.

Dr. Ruan is an attending psychiatrist at the Harris Center for Mental Health and IDD NeuroPsychiatric Center.


Lindsay Chapman, D.O.

Dr Chapman is a Staff Psychiatrist within the VISN 20 Health Care System.

Adriane dela Cruz, M.D.

Dr. dela Cruz is an Assistant Professor of Psychiatry at UT Southwestern Medical School.

Jessica Hutto, M.D.

Dr. Hutto is working at the North Texas VA Health Care System/Tyler Community Based Outpatient Clinic.


Nicholas Heyne, M.D.

Dr. Heyne is in private practice.

Austin Lin, M.D.

Dr. Lin is Assistant Professor of Psychiatry and Behavioral Sciences, McGovern Medical School at the University of Texas Health Science Center at Houston.


John Coleman, M.D.

Dr. Coleman works as an Army Psychiatrist in El Paso.

Paige Marnell, M.D.

Dr. Marnell is the Director of Addiction Services for Gateway Behavioral Health in Savannah, Georgia.

Zakaria Zayour, M.D.

Dr. Zayour is a Staff Psychiatrist at Dallas VA Medical Center and has a faculty appointment at UT Southwestern Medical School.


Fabrizzio A. Delgado, M.D. 

Dr. Delgado is an Assistant Professor of Psychiatry at UT Southwestern Medical Center and Site Director for Fellow Pain rotation at Parkland.

Ivanshu Jain, M.D.

Dr. Jain is working as a staff psychiatrist at Terrell State Hospital.

Radha Tripuraneni, M.D.

Dr. Tripuraneni joined the VA North Texas Healthcare System, working in the outpatient Grand Prairie clinic, primarily seeing addiction patients as well as patients with psychiatric disorders.


Ryan Mals, M.D.

Dr. Mals is a clinical addiction psychiatrist at Presbyterian Medical Group in Albuquerque, NM, serving in a broad range of settings including IOP, inpatient, outpatient clinic, research and community outreach/education throughout the state of New Mexico.

Amit Mistry, M.D.

Dr. Mistry is an addiction psychiatrist at the Substance Treatment and Recovery Clinic in the Oklahoma City VA Health Care System.

Veronica Perez, M.D.

Dr. Perez is the Division Director of Addiction Medicine at Baylor Scott & White in Temple, TX.


Devin Dunatov, M.D.

Dr. Dunatov will be joining a private practice in Phoenix, AZ, doing outpatient and residential substance use treatment.

Daniel Lavin, D.O.

Dr. Lavin will be working as an addiction psychiatrist for Baylor Scott and White in Temple, Texas.

Vivek Shah, M.D.

Dr. Shah will be working as a Staff Psychiatrist at North Texas State Hospital, Wichita Falls, Texas.

Addiction Psychiatry Fellowship 2021 Graduation


Dr. Arqam Abdali

Staff Psychiatrist, Michael DeBakey VA Health System Community Based Outpatient Clinic in Conroe, Texas

"My clinical experiences in medical school and residency have shown me the devastation addiction brings to people's lives, and those closest to them. Meeting people where they are in their journey and helping them in the process of recovery is a very special experience. This experience is what drew me towards Addiction Psychiatry. My clinical experience in the UTSW Addiction Psychiatry Fellowship has been outstanding. I've been able to learn from wonderful faculty who have truly shown me how to care for patients with empathy, and compassion. I hope to carry this knowledge to my future clinical work."

Dr. Poorvanshi Alag

Assistant Professor of Psychiatry - Texas Tech Health Science Center, Lubbock, Texas

Dr. Vecheslav Fedorchenco

Heading Health (Treatment Resistance Depression Clinic, Private Practice)

Dr. Stephanie Joseph

Amen Clinic in Irving-Las Colinas, Texas area (Private Practice)

Dr. Timothy Saeed

Telehealth position with Talkitry