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 masters 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 is the office manager and has been with the practice since 2019. She recently moved to Greencastle from Chambersburg and shares a home with her son, two dogs, two cats and one “crazy” kitty. She loves music and sings opera. Give her a call in the office if you have any questions, concerns or questions about crazy cats.

Karen – Insurance and Billing Specialist

Karen is from the Orrtanna area of Adams County and lives with her daughter in the family homestead. Karen has been with the practice for almost 15 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.


Spencer is from Shippensburg and is our full-time patient coordinator. He can help you with scheduling, on-line forms, patient portal access, financial questions and just about everything you need for your appointment.  He loves to travel, draw, paint and enjoys movies, concerts and broadway shows.  As a talented artist, his unique hobby of painting celebrities and stand-up comics before he attends their performance always gets an instant autograph for his collections. He is married to his wonderful wife and they have three cats that keep them on their toes.



Jillian is our part-time patient coordinator and receptionist. She lives in Waynesboro with her daughter Syara and their cats, Bow and Cassie. Jillian loves to read and take mountain rides in her free time and is the second youngest of six siblings. 


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, making candles and watching television show and movies. Kelly is married and has two daughters, one cat and a Golden Retriever.  

Jess – Dental Assistant 

 Jess joined our team in 2021 and calls Chambersburg home. She loves the sport of roller derby, enjoys cooking and spending time in the great outdoors camping. Jess has two daughters, and 3 cats.



Jasmine – Dental Assistant

Jasmine is one of our full-time dental assistant’s from the Chambersburg area recently joining the practice in early 2020 from another local office. She was born in Indiana, enjoys shopping and trying new restaurants and loves to travel. She lives with her dog, Arlo who loves to take road trips with her family. Jasmine is bi-lingual and can help translate for our Spanish speaking patients.

Krystal – Dental Assistant

Krystal is from the Chambersburg area and recently cross-trained from patient coordinator to dental assistant. Krystal has two amazing cats and loves to spend time with her family and friends, especially her young daughter. She loves to try new things and has been working at Mason-Dixon Endodontics for the last three years.


Lori hails from Madison, Alabama after living in 10 different states as a military brat.  She is a full-time dental assistant and enjoys cooking, trips to the beach, painting and camping.   So, if you see Lori in the office, make sure you ask her for her Gnocci Soup Recipe.