Meet Our Physicians

Donald A. Newman, MD, FACS

Dr. Newman received his undergraduate degree with honors from the University of Louisville in Kentucky. Dr. Newman then completed his MD degree at the University of Louisville School of Medicine. After graduating medical school, he then served a general surgery internship at the University of Medicine and Dentistry of New Jersey. Next, he performed a research fellowship at the University of Utah School of Medicine in Salt Lake City. During this research year, he did extensive research and development in the area of intraocular lenses. The results of this research have now become a part of the everyday practice of ophthalmology throughout the United States and the world. 

Following his research fellowship, Dr. Newman completed a three-year ophthalmology residency in the Department of Ophthalmology at the Pennsylvania State University Medical School at Hershey Medical Center. Dr. Newman was an associate clinical professor in the Department of Ophthalmology, in addition to working full time in private practice. In this capacity, he taught surgery to the eye surgeons in training at the Hershey Medical Center. Dr. Newman has published articles in medical journals, and has written several chapters in textbooks on various topics on ophthalmology. In addition, Dr. Newman was awarded a fellowship in the American College of Surgeons. In his spare time, he enjoys hunting and playing the guitar.

Angela G. Houser, MD

Dr. Angela Houser is the third generation Dr. Houser in her family. Her grandfather, Ben Houser Sr., MD, started the practice in Tamaqua in 1937.  He was an eyes, ears, nose, and throat specialist. Her father, Ben Houser Jr., MD, joined his father’s practice in 1969, and Dr. Angela returned home to join the practice in 1995.

Dr. Angela grew up in Mahoning Valley and graduated from Lehighton Area High School in 1982. She went on to Ursinus College in Collegeville, PA and graduated with a B.S. in 1986. She then attended Jefferson Medical College in Philadelphia and graduated with her M.D. in 1990. Dr. Angela did a year internship at West Reading Hospital, followed by a year working as a physician for Grenfell Regional Health Services in Newfoundland and Labrador, Canada. She returned to complete a three-year residency at Wills Eye Hospital in Philadelphia.

During her residency, Dr. Angela married Brad Christman from Lehighton. They have two daughters, Hannah and Abigail, and reside in Mahoning Valley. Dr. Angela also has two older stepdaughters, Brandie and Nicole, and five grandchildren. With her free time, she enjoys spending time with family, traveling, volunteering for her children’s school activities, gardening, and fishing.


Kathleen Tanner, OD

Dr. Kathleen Tanner joined Houser Newman Associates in June of 2017. She was born and raised in Hazleton, Pennsylvania, and graduated from Penn State University with a Bachelor of Science degree. Upon graduating, she pursued a Doctor of Optometry degree from the Pennsylvania College of Optometry at Salus University, where she graduated with academic and clinical honors. Dr. Tanner completed clinical externships at Hazleton Eye Specialists, Northeastern Eye Institute in Scranton, Eyecare Specialists in Kingston, Wilkes-Barre VA Medical Center, and a low vision rotation at the William Feinbloom Low Vision Center in Philadelphia.

Dr. Tanner practices full-scope optometry, and especially enjoys the treatment and management of dry eye, diabetic eye exams, low vision, glaucoma, contact lenses, and pre- and post-operative management of cataracts.  One of her main goals is to serve her local community by providing optimal eye care and comprehensive exams. During her spare time, Dr. Tanner enjoys outings with her family members, including her daughter and fiancé.

Joseph Pancher, OD

Dr. Joseph Pancher graduated from the Pennsylvania College of Optometry in 1989 after completing his undergraduate studies at Penn State University. Dr. Pancher is a primary care optometric physician who has practiced in an ophthalmology setting for more than 25 years. Outside the office, he enjoys hunting, fishing, and a new found interest in golf, when not busy protecting his three lovely daughters.


Maxwell Stem, MD – Retina

Dr. Maxwell Stem graduated Summa Cum Laude from Juniata College in Huntingdon, PA, and received his Doctor of Medicine degree from Penn State College of Medicine in Hershey, PA. At Penn State, Dr. Stem was inducted into the Gold Humanism Honor Society and also received the Exemplary Medical Student Award for his contributions to research, clinical medicine, community service, and leadership.

Dr. Stem completed a general internal medicine internship at Rhode Island Hospital/Brown University in Providence, RI. He performed his ophthalmology residency at the W. K. Kellogg Eye Center at the University of Michigan, where he was awarded the LaBerge Award for excellence in research and the Paul R. Lichter Resident Mentor Award for his leadership and dedication to teaching. Dr. Stem completed his two-year vitreoretinal surgery fellowship at Associated Retinal Consultants at the William Beaumont Hospital in Royal Oak, MI, during which time he received the Retina Fellows’ Forum Research Award.

Dr. Stem is Board Certified in ophthalmology. He is an active member of the Retina Service at Wills Eye Hospital, and is an Assistant Professor of Ophthalmology at Sidney Kimmel Medical College at Thomas Jefferson University.

Dr. Stem is a member of the American Academy of Ophthalmology, the American Society of Retina Specialists, and the American Medical Association. He has authored numerous scientific publications and textbook chapters on vitreoretinal diseases, and has been an invited speaker to present scientific papers and abstracts at national ophthalmic meetings. Dr. Stem’s areas of interest include macular degeneration, diabetic retinopathy, retinal vein occlusions, retinal tears/detachments, macular puckers, macular holes, and secondary intraocular lens implantation.

Sonia Mehta, MD – Retina

Dr. Sonia Mehta graduated Magna Cum Laude from Boston University and received her Doctor of Medicine degree from Boston University School of Medicine, where she was awarded the Dr. Samuel & Helen Poplack Award for Outstanding Clinical Competence and Excellence in Patient Care. Dr. Mehta completed her internship in General Surgery at the University of Pennsylvania-Presbyterian Medical Center. She performed her ophthalmology residency at the University of Pennsylvania and Scheie Eye Institute. For her dedication and excellence in teaching, she was awarded the University of Pennsylvania Department of Ophthalmology Teaching Award by the faculty and students. Dr. Mehta completed her two-year vitreoretinal surgery fellowship at Emory University, where the Department of Ophthalmology recognized her two years in a row for outstanding clinical research.

Dr. Mehta is Board Certified in ophthalmology. She is an active member of the Retina Service at Wills Eye Hospital and is Assistant Professor of Ophthalmology at Sidney Kimmel Medical College at Thomas Jefferson University. Dr. Mehta has authored numerous articles and book chapters on vitreoretinal diseases, and has lectured and taught instructional courses at ophthalmology meetings, both nationally and abroad. Dr. Mehta is also the author of Step-Up to the USMLE Step 1, among the best-selling medical textbooks, now in its fifth edition.

Dr. Mehta has expertise in all areas of retinal surgery, including macular holes, macular pucker, retinal detachment, and diabetic vitrectomy. She is actively involved as a clinical investigator in several clinical trials pertaining to age-related macular degeneration, diabetic retinopathy, retinal vein occlusions, uveitis, and vitreoretinal surgery. Dr. Mehta is a member of the American Academy of Ophthalmology, American Society of Retina Specialists, Association for Research in Vision and Ophthalmology, American Medical Association, and Pennsylvania Medical Society.

Anthony Silvetti, OD – Low Vision

Dr. Silvetti graduated from Bloomsburg University in 1984 with a degree in Biology. After that, he  attended The Pennsylvania College of Optometry, where he received The Harold Kohn Memorial Award and The Donald H. Evans Award in 1989. He attended his externship  at The William Feinbloom Low Vision Center in Philadelphia.  Since then, Dr. Silvetti has provided  low vision services in neighboring communities for over 20 years. 

Dr. Silvetti joined our team in September 2018 and will be providing low vision services to our patients. He provides a thorough clinical low vision exam, which is different than your typical eye exam, and he uses special testing materials to evaluate how a person with low vision sees. He prescribes low vision devices as needed to help the patient achieve optimal vision and quality of daily activities.

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