Meet The Staff

The surgical staff at Mason-Dixon Endodontics are experienced, caring, and professional.

The administrative staff is friendly and helpful. They are well-versed in health insurance policies. They will help you to understand and maximize your insurance benefits.

Jeff – Business and Professional Relations Manager

Jeff is married to Dr. Yingling and together they have operated and managed Mason-Dixon Endodontics since 2002. Jeff is the Business Manager and recently took on the role of our Professional Relations Manager to ensure our referring doctors and practices know they matter and that we are taking excellent care of their patients. Jeff was the flexible working parent over the years, but the Yingling’s three children are now independently mobile, so he is back in the office and on the road visiting offices. He is a retired Air Force Lieutenant Colonel and served in the Persian Gulf War. Jeff graduated from West Virginia University and earned his master’s degree at Webster University while stationed in Iceland. He was assigned to bases in Texas, North Carolina, and Iceland before he met Dr Yingling at Aviano AB, Italy. They have lived in Germany, Virginia and DC prior to moving back to Central Pennsylvania where Jeff was born and raised. He has volunteered for numerous organizations over the years including the Gettysburg Youth Soccer Club, Gettysburg Warriors Athletic Booster Club, Ski Liberty Mountain Safety. Make sure you wave to Jeff in the hallway – he will probably be on the phone!

Destinie – Office Manager

Destinie has been with the practice since 2019. She recently moved to Greencastle from Chambersburg and shares a home with her loving husband, two mischievous sons, four dogs, and a cat. She loves music and sings opera. A woman of many hats, you will see her at the front desk checking patients in and out, out and about at your general dentist office bringing gifts and goodies and in the clinical area setting up rooms or even seating you and doing your intake x-rays! Give her a call in the office if you have any questions or concerns.

Karen – Insurance and Billing Specialist

Karen is from the Orrtanna area of Adams County and has 3 children. She currently lives with her daughter and her cat Speedy in the family homestead. When Karen isn’t in the office, she loves to play golf and spend time with her family. Karen has been with the practice for almost 19 years and has worked in every dental position in the office over the years. She works out of our Gettysburg office but serves as our insurance expert in both locations. If you have a question about your insurance plan or need help understanding a recent bill, give Karen a call.

Bianca- Lead Clincal 

Meet Bianca! She was born and raised in Wolzburg, Germany and after years of traveling her family settled in Franklin County. When she is not in the office, Bianca loves spending time in the great outdoors hiking with her husband and Golden Retrievers’, Oakley and Gail. She is relatively new to the dental field but is fascinated by Endodontics. She has years of management experience which has sculpted her into a fantastic leader of our clinical team. 

racheal-dental assistant

Racheal lives in Waynesboro with her husband Jake and her son Brock, along with Magnus the dog and Archie the cat. She loves paint nights, snowtubing, spending time with family and friends and of course, shopping! Racheal and her husband love cars and on a warm day you may see her arriving in her gorgeous corvette! Racheal has been in the dental field for many years and her knowledge, warm smile and friendly attitude will definitely make you feel at ease!

Melissa -Dental Assistant

Melissa joined Mason Dixon Endodontics after years away from dentistry to raise her family, but her love of the field brought her back. She was raised in Southern New England and recently moved to Greencastle from Rhode Island. She lives with her husband, 3 beautiful children and 4 fur babies. When not in the office, you will find her vacationing with her family or looking for the next best karaoke spot. 

Kelly-Expanded functions dental assistant


Maggie-Patient coordinator

Meet Maggie, or as we call her “little Jim Carrey”! She is hilarious and always has a joke or a goofy story to tell. If you are nervous while checking in, she is sure to put you at ease with a good laugh. When not at the office, Maggie is at home with her beautiful little boy named Bennett, who is just as silly as her and a joy when he stops in to visit us in the office. She also enjoys spending time with her 2 dogs, Khione and Shiloh and she loves reading and watching movies.

Brenda-Patient Coordinator