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 Office 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 husband, two sons, four dogs, and a cat. She loves music and sings opera. Give her a call in the office if you have any questions or concerns especially about crazy cats.

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.

Nichole – Lead Patient Coordinator

Nichole lives in Chambersburg and is our full-time Lead Patient Coordinator that joined our team in late 2021. Nichole loves working on projects around the office, and you can often catch her deep in thought, when she is not on the phone scheduling appointments, as she contemplates new computer creations and patient enhancements to maximize your positive patient experience. She is married with two little boys at home and two fur babies, Koda and Ace. Nichole loves crafting, making wreaths, online shopping and making her grandmother’s home-made lasagna.

Brenda – Patient Coordinator

Maggie – Patient Coordinator

Meet Maggie, our newest addition to the administrative team! 


Kelly is our licensed Expanded Function Dental Assistant (EFDA) born and raised in the great state of Texas. Kelly joined our staff in 2021 and enjoys visiting with family, crocheting, loom knitting, and enjoying a great pizza, toppings first of course! Kelly is married and has two daughters, one cat, a Golden Retriever, and a Betta Fish.

RACHEL Z – Dental Assistant

Rachel is a full-time dental assistant who joined our practice in the Fall of 2021. She is a newlywed and currently resides in Greencastle with her husband and her Welsh Terrier, Cooper. In her free time, she loves going to concerts, binge watching a good TV series, and boutique shopping! When she’s out of the office she can be found at a local cafe enjoying a delicious cup of coffee with her bestie chatting about their next travel destination.

Bianca – Dental Assistant

Meet Bianca! She was born and raised in Wolzburg, Germany. After years of travelling her family settled in Franklin County. She loves spending time hiking with her fiancé and their Golden Retrievers’, Oakley and Gail, and snuggling up with her elderly Chihuahua Boo to watch The Bachelor. When she’s not in the office learning the ropes, she likes to steal some time to go kayaking with her bff and her nephews. She is new to the dental field but is fascinated by Endodontics, so she has shifted her studies from the medical field to the dental field!

Racheal – Dental Assistant

CHae – Sterilization Tech