Meet Our Doctors

About Us | Vivid Vision | The RCT Experience | Modern Technology | Meet Our Doctors

Ronald C. Taylor, DDS, MSD

Dr. Ronald Taylor received his bachelor’s degree from the State University of New York at Stony Brook.  He enrolled in dental school at the University of Maryland he did an externship at the University of Dundee Dental School in Dundee, Scotland.  He completed his dental training and received his Doctor of Dental Surgery (DDS) degree from the University of Maryland.  Dr. Taylor returned to New York and completed advanced training in a General Practice Residency (GPR) program at The Bronx-Lebanon Hospital Center.  He completed his endodontic specialty training and successfully defended his thesis, receiving his certification in endodontics and his Master of Science in Dentistry (MSD) degree from Case Western Reserve University in Cleveland, Ohio.

In addition, he currently serves as an associate professor at Howard University College of Dentistry and as an appointed member of the Dean’s Faculty as a clinical assistant professor at the University of Maryland, Baltimore College of Dental Surgery.  He has been a mock board examiner for endodontic residents in the United States Navy Post Graduate Endodontic Residency Program, the Medical College of Virginia, Boston University and the University of Maryland.   He has been appointed by the American Board of Endodontics College of Diplomates to serve as a mentor to board eligible endodontists.  He conducts several lectures and seminars on modern endodontics throughout the nation.  He is a diplomate of the American Board of Endodontics and a member of the American Association of Endodontists, the American Dental Association, and the National Dental Association.  Dr. Taylor is an alumnus of the Pankey Institute in Key Biscayne, Florida and he continues his study at the Walter Reed National Military Medical Center in Bethesda with the Edward C. Penick Endodontic Study Club.  He is the past president of the Penick Endodontic Study Club.  In 2020 Dr. Taylor was recognized by his peers as a Top Dentist!

Dr. Taylor is proud to be a specialist member of the American Association of Endodontists. He was also selected to Washingtonian Magazine's List of Top Dentists for 2009.  Dr. Taylor is married to his lovely wife Chalissa and has two beautiful children, Kayla and Evan.  He enjoys traveling, deep-sea fishing and music.

Adam W. Orgel, DDS, MS

Dr. Adam Orgel is a native Washingtonian having attended Richard Montgomery High School in Rockville, MD. He received his bachelor’s degree from the University of Maryland and continued on to obtain a Doctor of Dental Surgery (DDS). He remained at the University of Maryland receiving a Masters in Oral Biology while completing his endodontic residency. Dr. Orgel was presented with the Tony M. Ponti Memorial Award, which is presented to one graduating senior for excellence in clinical endodontics.

Dr. Orgel has been heavily involved with dental research. He worked as an intern at the National Institute of Dental and Craniofacial Research (NIDCR) at the National Institute of Health (NIH) and has had multiple publications. He also placed second at the American Association of Endodontics Annual Conference for his oral presentation on the relationship between oral bacteria and endodontic treatment.

Dr. Orgel practices in Bowie, Laurel and Silver Spring, Maryland. He is a specialist member of the American Association of Endodontists. In addition, he is a member of the American Dental Association, Maryland Dental Association, and Southern Maryland Dental Association. Dr. Orgel continues his learning at the Walter Reed National Military Medical Center in Bethesda with the Edward C. Penick Endodontic Study Club. He is also a founding member of the Premier Study Club in Bethesda.Dr. Orgel is married to his wonderful wife, Rachel.  He enjoys traveling and playing tennis in his free time.

Badri Jureidini DDS, MS

Dr. Badri Jureidini attended the University of Wisconsin Madison for his undergraduate degree. He graduated with a Bachelor of Science degree in Zoology with High Honors. He attended the University of Minnesota School of Dentistry, and earned his Doctor of Dental Surgery degree with High Distinction. After 5 years of private practice in general dentistry in Minneapolis, Minnesota, he was accepted into the endodontic specialty program at the University of Minnesota from which he earned his Master of Science degree and Certificate in Endodontics.

Dr. Jureidini joined a large, private, group endodontic specialty practice in Minneapolis, and had the opportunity to treat a large number of patients of all ages with complex surgical and non-surgical endodontic needs. He concentrated on treating patients efficiently with compassion, care, and devotion to their individual needs. Focusing on treating patients like they are members of his own family continues to be his goal today. Dr. Jureidini also had the opportunity to treat underprivileged patients in underserved areas while living and practicing in Minnesota.

Dr. Jureidini joined RCT Endodontics in May 2016 and works at the Laurel office. He is dedicated to providing quality, pain-free endodontic care to his patients, and to customize each procedure to accommodate each patient’s comfort regardless of age, case complexity, medical history or anxiety level. He takes pride in patiently listening to each patient’s complaint, and addressing it to the best of his ability.

Juheon Seung, DDS, MS

Dr. Seung is an Endodontic Surgery Specialist. He earned his DDS from the University of Maryland, Baltimore School of Dentistry and later returned to University of Maryland for a Master’s Degree in Science and Specialty Certificate in Endodontics. During his specialty training, Dr. Seung was the chief resident in addition to being a representative to the Advanced Dental Education Director’s Meetings.  He’s also a recipient of a research grant from the American Association of Endodontist (AAE) Foundation for his research on Endodontic Material.  Dr. Seung successfully completed a one-year residency at the Veteran’s Affairs Medical Center (VAMC) in Washington D.C prior to his specialty training.

Currently, Dr. Seung serves as a representative for new Endodontic practitioners at the AAE. He is a member of the American Dental Association (ADA), American Association of Endodontists and locally, the Maryland State Dental Association, Maryland Korean Dental Association, Edward C. Penick Endodontic Study Club. He is also affiliated with the University of Maryland Medical Center located in Baltimore, Maryland.

Dr. Seung currently lives in Baltimore with his wife and is an avid Terrapin basketball and Baltimore Orioles fan.

Chayne Coston, DDS

Dr. Coston completed his Bachelors of Science degree at Howard University, as well as graduated with a doctor of dental surgery at the top of his class from Howard University’s College of Dentistry.  He further completed hospital-based training through a residency program at the Bronx-Lebanon Hospital Center in New York.   This is where he chose to specialize in endodontics and completed a two-year residency program at the world-renowned New York University (NYU) College of Dentistry.

Dr. Coston brings his passion for dental surgery and root canals to our practices and our patients notice it right away!

Dr. Coston has volunteered his dental services through NYU’s global dental outreach with Henry Schein Cares. In addition, he has volunteered with the Boys & Girls Club of America, Congressional Black Caucus, Latino health fair, NDA Annual Day on Capitol Hill, Student National Dental Association oral cancer walk, Deamonte Driver Dental Project, Give Kids A Smile, Delta Phi Sigma clothing drive, Thanksgiving food drive, Special Olympics Haiti Relief Food Drive.

Dr. Coston is fluent in Spanish.  He is an active member of the American Association of Endodontists (AAE), the American Dental Association (ADA) and the District of Columbia Dental Society (DCDS).

In his free time, Dr. Coston enjoys staying active, playing sports, reading, relaxing with friends and enjoying live comedy and music.

Marc Jiorle, DDS

Dr. Marc Jiorle received his bachelor's degree from the University of Notre Dame. Inspired by his father, an orthodontist, and his sister, an endodontist, Dr. Jiorle decided to follow in their footsteps and pursue a career in dentistry. While attending Stony Brook School of Dental Medicine in Long Island, NY, Dr. Jiorle fell in love with all aspects of endodontics, particularly the aspect of getting patients out of pain. His passion for endodontics earned him the American Association of Endodontists Education Achievement Award. Upon graduating dental school, Dr. Jiorle gained additional training in all aspects of dentistry, with an emphasis in endodontics in a general practice residency at Newark Beth Israel Medical Center in Newark, NJ. Dr. Jiorle then continued his training with an endondontics residency at the University of Pittsburgh, where he also had the opportunity to treat our nation's heroes at the Pittsburgh VA Hospital and sought advanced training in endodontic microsurgery.

In his free time, Dr. Jiole enjoys cooking, exercising, playing basketball and softball, and is a diehard Notre Dame football fan. He is excited to be a member of RCT Endodontics and is eager to explore the DMV community to explore all that the area has to offer.

Tierney Winberg, DDS

Dr. Tierney Winberg is originally from Minnesota but has been in the D.C. area for many years. Having earned a Master’s Degree at Georgetown University, Dr. Winberg went on to Dental School at the University of Maryland in Baltimore where she graduated at the top of her class. She completed her specialty training in endodontics, also from the University of Maryland.  While there, she received extensive training in clinical endodontics, including microsurgery, regenerative therapy, traditional root canal treatment and retreatments.  Dr. Winberg also spearheaded an ambitious clinical research project investigating new techniques for endodontic treatment, and the use of novel cone-beam computed tomographic analysis for endodontic healing.

Dr. Winberg is a member of the American Association of Endodontists and the American Dental Association. She is a current candidate for Board Certification by the American Board of Endodontists, which represents the highest level of clinical skill and knowledge in the field.

Dr. Winberg’s first commitment is to excellence in her clinical work while providing empathetic and caring treatment for her patients.  Dr. Winberg strives to make the endodontic experience as pain-free as possible with the least amount of stress for the patient.  

Dr. Winberg and her family love living in the D.C. area. When not working, she enjoys reading, exercising and, most of all, spending time with her daughter.

Alexis J. Herring, DDS, MSD


Dr. Alexis J. Herring, originally from Fairfax, Virginia, earned her Doctor of Dental Surgery degree from Howard University College of Dentistry. She was inducted into the Omicron Kappa Upsilon National Dental Honor Society, which is the highest level of achievement that dental students strive for. Upon graduating from dental school, she completed her endodontic specialty training at Case Western Reserve University, the premiere endodontic training program in the country.

Dr. Herring has a passion for community outreach and has participated in several Mission of Mercy projects, mission trips to Treasure Beach, Jamaica with the Christian Dental Society, the Lessons in a Lunch program and so much more.

Through high-quality endodontic treatment, she is committed to improving her patients' quality of life and comfort. Her ability to show empathy and compassion toward her patients makes them feel at ease, fostering a pleasant and comfortable treatment experience.

She believes that with dedication, "What seems impossible today will become your warm-up tomorrow!"

Eunice Kim, DDS, MS

Dr. Eunice Kim received her bachelor’s degree from Colorado State University. She then attended the University of Maryland, Baltimore School of Dentistry where she earned her degree in Doctor of Dental Surgery (DDS). She was awarded the Irving I. Abramson Award, which is presented to one graduating senior for excellence in endodontics. Dr. Kim continued her advanced training in a hospital-based General Practice Residency (GPR) program at Christiana Care Health Systems in Wilmington, Delaware. Following her completion of GPR, Dr. Kim returned to the University of Maryland where she completed a three-year endodontic specialty residency while also obtaining a Master's Degree. During her endodontic residency, Dr. Kim conducted the first known clinical research in evaluating new supplemental files (XP-endo Finisher) on the removal of bacteria and endotoxin.

Dr. Kim is a currently a member of the American Association of Endodontists (AAE), American Dental Association (ADA), Delaware State Dental Society (DSDS), and the Edward C. Penick Endodontic Study Club. When not treating patients, she enjoys hiking, reading books, traveling, and spending time with her family.