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Our Providers

Our providers believe in giving the best possible care and will go above and beyond to prioritize your medical needs.

John Meiser, M.D., P.A.

John Meiser


Dr. Meiser has specialized in allergy, asthma, and immunology since 2001, and is certified by the American Board of Allergy and Immunology. He grew up in Austin and received his Bachelor of Business Administration degree in Finance from the University of Texas at Austin. Dr. Meiser graduated from medical school and completed his combined Internal Medicine/Pediatrics residency at The McGovern Medical School, (formerly The University of Texas Houston Medical School). He completed his allergy and immunology fellowship training at the National Jewish Medical and Research Center in Denver. He has served as a reviewer for the Annals of Allergy, Asthma and Immunology since 2006. Dr. Meiser focuses his attention on finding the best individualized treatment plan for each patient. Dr. Meiser and his family live and attend church in Frisco. His interests include pickleball, tennis, running, fishing, and he became scuba certified in 2023.

Daniel Har


Dr. Har was born and raised in New York. He graduated from Johns Hopkins University and attended medical school at Albert Einstein College of Medicine in New York. He then moved to Dallas to complete both his residency and fellowship training at UT Southwestern, after which he joined Allergy & Asthma Center of Texas in 2018. He remains involved at UT Southwestern as a volunteer faculty member, and recently was chosen for the “outstanding teaching” award. At AACT, he enjoys teaching moments with the staff, including hosting an annual Jeopardy with allergy-related questions. Most importantly, however,  Dr. Har focuses on building relationships with families and providing personal care to both adults and children. Outside of the office, Dr. Har enjoys playing basketball and exploring the world with his wife and young daughter.

Kisha Long

PA-C, Physician Assistant

Kisha is a physician assistant who has specialized in allergy and asthma since joining Allergy & Asthma Center of Texas in 2011. She is a native of the Texas/Oklahoma area and completed her undergraduate education at East Central University in Ada, Oklahoma. She then received her Master's degree in Physician Assistant Studies at the University of Texas Southwestern Medical Center in Dallas. Kisha loves getting to know her patients and working to provide them with the education and tools necessary to manage their conditions. She has a passion for asthma education and food allergy management/ awareness. She takes pride in staying up on current guidelines and practice parameters in order to provide her patients with the best care possible. Kisha is married to her high-school sweetheart and has 2 children. In her spare time she loves spending time with her family, shopping, decorating and is active in their church.

Rebecca Hauser

PA-C, Physician Assistant

Rebecca is a physician assistant who joined the Allergy & Asthma Center team in 2023 after graduating from the University of North Texas Health Science Center Physician Assistant program in Fort Worth. She grew up in Southlake and received her Bachelor of Business Administration degree in Marketing from Oklahoma State University. Rebecca values building long-term relationships with her patients based on empathy and trust as well as providing education and care to improve their well-being. Outside the office, you may spot her in a local thrift store or concert venue. Additionally, she enjoys photography, gardening, and volunteering in the community.

Our goal is to provide exceptional care to you and your family.