Meet the Doctors
R. Greg Maul, DO, FACOFP 
R. Greg Maul, DO, FACOFP is a Family Practice Physician who is Board-Certified by the National Osteopathic Boards, as well as Board-Certified and Recertified by the American Osteopathic Board of Family Physicians. Dr. Maul earned his Doctor of Osteopathic Medicine Degree at Kirksville College of Osteopathic Medicine. He completed an Internship at the Dallas/Fort Worth Medical Center in Grand Prairie, Texas.
Dr. Maul's present professional appointments include Clinical Assistant Professor and Associate Professor at the University of North Texas Health Science Center/TCOM, as well as Assistant Clinical Professor at the Department of Family Practice at Texas Tech University Health Science Center in Lubbuck, Texas.
Dr. Maul is the Board of Governor, ACOFP and 2004-2005 President, ACOFP. He is the Past President of the Texas Osteopathic Family Physicians and Past President of the Texas Society of American College of Osteopathic Family Physicians. Dr. Maul is a member of the Texas Medical Foundation and American Osteopathic Association.
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Paulo Calderon, MD
Paulo Calderon, MD is a Board-Certified Family Medicine Physician. Dr. Calderon earned his Medical Degree at the University of Texas Health Science Center in San Antonio, Texas. He completed a Family Medicine Residency at Scottsdale Healthcare Hospital- Osborn in Scottsdale, Arizona.
As a medical student, Dr. Calderon served as a research assistant for respiratory and neuroscience research studies. He was a member of an international research team that studied the growth patterns of children in West Africa. His research is published in a peer-reviewed medical journal.
Dr. Calderon is fluent in Spanish.
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Ruth Robert, NP-C
Ruth Robert, NP-C is a Certified Family Nurse Practitioner with more than 18 years of full time nursing experience. Ruth earned a Bachelor of Science in Nursing at Punjab University in Ludhiana, India and Master of Nursing at Delhi University in New Dehli, India. She completed the Family Nurse Practitioner Post Masters Certification Program at Texas Women's University in Dallas, Texas. Ruth is enrolled in the Doctorate of Nursing Program at TWU in Denton, Texas. In addition, Ruth holds an Advanced Diploma in Hospital Administration from the Institute of Health Care Administration in Madras, India.
Ruth's honors and awards include:
- 2008 Nurse Week Nursing Excellence Award for South Central Texas & Louisiana for Teaching.
- 2005 Florence Nightengale Award from Baylor, Garland, Texas.
- 2001 Poster Presentation on Dengue Fever at an International Conference on Infectious Disease, Muscat, Sultanate of Oman, 2001.
- Highest Score with Distinction, University of New Dehli, India
- President's Gold Medalist for Highest Score, University of Punjab, India
Ruth is a member of the American Academy of Nurse Practitioners, American Academy of Critical Care Nurses, and Academy of Medical Surgical Nurses.
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Request an appointment online or schedule your preferred appointment at Dr. Maul's Family Practice by calling (972) 463-3100 for our location in Rowlett, Texas or (972) 853-0444 for our location in Lavon, Texas.
Same day walk-in appointment times available!