ATX Endodontics

(Austin Location)

7800 N. MoPac Expy #250
Austin, TX 78759
(512) 345-9779

ATX Endodontics

(Round Rock Location)

1830 Round Rock Ave #100
Round Rock, TX 78681
(512) 341-7373



Dr. Stephen Simon


Dr. Stephen Simon received his Bachelor of Science in Biology from Boise State University in 2001. He began his professional education at Case Western University School of Dental Medicine in Cleveland, Ohio, where he received his Doctor of Dental Surgery degree in 2006. After completing his degree, Dr. Simon gained valuable experience as a general dentist serving at Fort Hood, Texas, for four years in the United States Army. After serving honorably as a dental officer in the military, including a tour in Iraq, he completed a residency in endodontics at the Texas A&M Baylor College of Dentistry in Dallas, Texas, in 2012. As a resident he presented table clinics at the American Association of Endodontist conventions and published research in the Journal of Endodontics, which studied injection pain and onset of local anesthetics. Since then he has practiced endodontics in group practices in the northwest and Texas.

Stephen was raised in Eastern Idaho. He is a bit of a mountain man and has an adventurous spirit. He grew up participating in many outdoor sports and loves to snow ski. As a young man before entering the halls of higher learning he served a two year mission for his church in Bentonville, Arkansas. Stephen, is a loving husband and lucky father to four beautiful girls. He enjoys spending time with his wife and children.

Dr. Simon is excited to provide compassionate care and further develop relationships with patients and colleagues in the Austin area.


Dr. Mulko-Scheufele


Dr. Natasha Mulko-Scheufele strives for success in all aspects of life. She graduated Summa Cum Laude from Creighton University Dental School in Nebraska, then pursued post-graduate work in Endodontics at Tufts University School of Dentistry in Boston, where she obtained her certificate in Endodontics. She was a Pre-Doctoral Endodontic Clinic Supervisor; instructing pre-doctoral dental students in the proper execution of root canal therapy at Tufts Dental School.

In her early career, Dr. Scheufele graduated with Honors in Chemistry from Dartmouth College and has been published in a scientific journal for her research efforts. She is a board certified Diplomate of the American Board of Endodontics, Dr. Scheufele has worked as a general dentist in Massachusetts, as an Endodontist in the D.C. area, and as an Endodontist for the U.S. Army Dental Corps Reserves. She most recently worked for 5 years as an endodontist in a private practice in San Antonio before moving to Austin. She is fluent in Spanish.

Outside of doing root canals, Dr. Scheufele enjoys spending her free time with her family. Together, they spend as much time as possible outside, especially going for walks on the trails. They attend the Austin Stone Church.

BioPic Houston

Dr. Houston


Dr. Mark Houston was born and raised in the Pacific Northwest. He attended Washington State University, where he graduated with honors, earning a Bachelor of Science in Biology. He then graduated from Lake Erie College of Osteopathic Medicine, earning his Doctor of Dental Medicine degree.

Dr. Houston served four years as a general dentist in the United States Army. During this time, he advanced his skills and knowledge with continuing education and mentorship. In addition to his clinical duties, he served as Patient Safety Officer to improve patient safety and ensure infection control standards.

Following his Army service, Dr. Houston completed a residency training program at Louisiana State University, where he earned a certificate in Endodontics and a Master of Science in Dentistry degree.

Dr. Houston is committed to treating patients with compassion and respect while addressing their dental needs.


Dr. Cecchin


The team at ATX Endodontics is proud to announce Dr. Doglas Cecchin, DDS, MS, PhD, as the newest member of our esteemed doctors. He will be joining us this coming August.

Dr. Cecchin, originally from Brazil, has completed his first specialization in Endodontics from the University of Ribeirão Preto, Brazil (in 2009), pursued a Masters (University of São Paulo, in 2009) and a PhD (State University of Campinas, in 2012) in Restorative Dentistry with focus in Endodontics. He taught as a clinical instructor and associate professor at the post-doctoral endodontic program at the Department of Endodontics, University of Passo Fundo, Brazil from 2011 to 2022. He maintained a private practice limited to Endodontics in Passo Fundo, Brazil, from 2011 to 2022. Dr. Cecchin has published over 100 papers in recognized journals, such as Journal of Endodontics, International Endodontic Journal, Dental Materials, among others. After moving to the United States, Dr. Cecchin completed his second Endodontic Specialty Program at University of Louisville KY in 2024, where he also received the Master of Science in Dentistry degree.

In his free time, Dr. Cecchin enjoys biking, traveling, watching sports, cooking and, of course, spending time with his wife and two children. In addition to English, he is also fluent in Portuguese and Spanish.