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 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 husband, two sons, three dogs, and two cats. 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 one of our full-time patient coordinators. 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. 



Nichole lives in Chambersburg and is one of our full-time patient coordinators that joined out team in late 2021. Nichole loves projects and you can often catch her deep in thought, when she is not on the phone making appointments, as she contemplates new computer creations and patient enhancements to maximize your positive patient experience in our office. She is married with two little boys at home and one furry, friendly Beagle named Ace. Nichole loves crafting, making wreaths, on-line shopping and making her grandparents home-made Lasagna from the old country. 


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 – LEAD 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, 3 cats, and a dog.

RACHEL – Dental Assistant

Rachel is our newest full-time dental assistant and joined our group in the Fall 2021. Rachel is engaged and currently resides in Greencastle. She loves to interact with patients, but she really really loves coffee! When she isn’t at Dunkin or Starbucks in her free time, she enjoys getting her nails done, going to the movies, watching TV series and shopping. She has a Welsh Terrier named Cooper that keeps her busy at home! 

Krystal – Dental Assistant

Krystal is from the Chambersburg area and recently cross-trained from patient coordinator to dental assistant. She is a part-time assistant in the office. 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 five years.


Angie is a part-time Dental Assistant from the Gettysburg area and now lives in Chambersburg. She is attending Allegany College of MD to get her Dental Hygiene license. Angie has worked in several local offices over the years and works in our office when she is not in school full time. She has a Habenese cutie dog named Bella. In her free time, she likes to travel and explore different places. Angie has Vietnamese and Mexican heritage and loves visiting with her multi-cultural relatives.