LEADERSHIP

Taseer formed ZT Corporate in 1997 to offer unique investor-owner opportunities to clients. The company has a diverse investment portfolio that it owns and operates, including its flagship operations, Altus Community Healthcare, a multi-disciplinary healthcare services provide, ZT Financial Services, ZT Motors, and more. ZT Corporate has grown into a $600+ million business adding 50 plus individual businesses to its portfolio. He began several small business in high school and college, where he learned how to build trust and exercise financial discipline. After finishing his bachelor’s degree in Entrepreneurship and Finance from Texas A&M, he joined Morgan Stanley in New York.

Ali Tariq has been working in Finance within the Healthcare industry since the start of his career, 13 years ago. Ali started his career with ZT as an analyst, focused on the healthcare portfolio of ZT, providing analytical oversight and governance for ZT’s heal care assets ranging from Surgical hospitals & Emergency Rooms to Post Acute & VBC businesses. Prior to rejoining ZT in 2023, Ali worked as a Director for Kelsey Seybold, the largest private multispeciality provider in Houston and worked through the post transaction integration of Kelsey after it was bought out by Optum for United Healthcare in 2022, Ali has since rejoined ZT and is currently the CFO for Altus and its portfolio of Emergency Room assets.

Dr. Sandeepkumar Singh is an Emergency Department Physician working with veterans and the Central Texas communities for the past seven years. With over 20 years of healthcare experience, Dr. Singh is the Chief Medical Officer for Altus Community health where he oversees the strategy, operation, and contracts for over 140 physicians. Dr. Singh holds a Doctorate of Medicine from University of Texas Southwestern Medical Center along with a Master in Health Administration.

Darleen Callahan is the Vice President of Revenue Cycle. She resides in Cypress, Texas now but grew up in a small town in upstate New York. Her early start in medical billing was answering phones and checking in patients in an Ear, Nose and Throat medical office. During her time in New York, she held various positions in medical billing, contracting and revenue cycle management. Being a Provider Relations representative at BCBS gave her perspective of the insurance claims processing side of medical billing. She was part of an ICD-10 Talk Ten Radio Program, an EPIC implementation team lead and authored a Patient Financial Guide that was used in the network hospital patient education program while in New York.
After relocating to Texas, Darleen experienced free standing emergency centers for the first time. In the last six years, she has been able to develop her knowledge and understanding of the challenges they face. She has used her skills and experience to grow and sustain revenues in her last Director role at RTMC. Throughout her career, Darleen has focused on operational efficiency, strategic planning, performance management and professional development for her teams. She focuses on streamlining performance, optimizing workflows and team building.
You will find Darleen either on one of her horses or with her dogs when she has some free time. She grew up riding and competing horses in Eventing and Dressage. These days she prefers to teach others how to ride but still attends competitions a few times a year. Darleen is also a big supporter of dog rescue and has fostered many dogs and puppies over the past few years.