All professionals at Elgin Pediatrics maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in the medical field. Read on to learn more about our staff's experience and training.

Dr. Karen English, MD

Dr. Marta Katalenas

A Board Certified Pediatrician, Dr. Katalenas graduated from the University of Oviedo Medical School, located in Northern Spain, in 1982. She worked as a General Practitioner in her hometown of Oviedo, and also performed Clinical Medical Research Projects at the University Medical School.

Dr. Katalenas completed her Pediatric Residency training at Morristown Memorial Hospital in Morristown, New Jersey, affiliated to Columbia University of New York. For one year she was part of the Pediatric Hematology-Oncology Team at Columbia Presbyterian Children’s Hospital of New York, taking care of children with cancer and blood disorders.

While in New Jersey, she worked at Northwest Covenant Medical Center in Denville, as a Hospital Pediatrician, and at Hackensack University Medical Center, Tomorrow’s Children Institute, in the Hematology-Oncology floor and Pediatric Intensive Care Unit.

Annie Croft, CPNP

Helena Hernandez

Helena is a board-certified physician assistant and a proud Texan. She was born in Manila, Philippines to a family of doctors, but came to Texas as fast as she can. She studied pre-medicine, international studies, and chemistry at Baylor University, and then health IT and informatics at the University of Texas at Austin. She worked as a healthcare business analyst at eClinicalWorks in Boston for 3 years, then as a clinical assistant at Seton Medical Center in Austin for one year. Helena obtained her Masters of Physician Assistant from Wichita State University in Kansas in July 2019 and was board certified in August 2019.

Helena enjoys cooking, weight-lifting, hiking, and any water sport. She loves to learn about different cultures and is trilingual (and counting), but considers herself a small town girl and a child at heart. She volunteers for Foundation Communities where she hosts a monthly community luncheon. She is an active member of Dane’s Body Shop where you will find her lifting weights 6-7 days a week.


Annie Croft, CPNP

Jonathan Dollison

Jonathan Dollison is a Physician Assistant of 10 years. He is board certified from the National Commission on Certification of Physician Assistants. He attended and graduated from the University of Michigan/Ann Arbor in 2006. Soon After he then began his Physician Assistant Program at Jefferson College of Health Sciences/ Radford University in Roanoke, Virginia in 2007. He received his Physician Assistant diploma in 2009. Jonathan Dollison has spent over 8 years in Pediatric practice serving the Corpus Christi/Coastal Bend region.

He also has spent time in various other specialties including Orthopedic Surgery. Jonathan Dollison has since childhood held a passion for Pediatrics. He practiced Pediatrics immediately post Hurricane Harvey in 2017 in the Coastal Bend Region and helped rebuild the Pediatric medical community. He is now proud to join the practice to serve the Greater Austin area. .Jonathan of course enjoys spending time with his son (12) and twin daughters (9). He also enjoys running, reading, and playing sports

Contact Us

Elgin Pediatrics

An Affiliate of Pediatric Center of Round Rock

(512) 281-1900
218 W. US 290 Elgin, TX 78621