Our Mission

Our mission is to give our clients honest advice, competitively priced policies, and a customer experience that makes us your one-stop insurance shop.


Tom Mertz founded Keystone Insurance Associates in 1988. Growing up, his family business was life insurance. After years of working for Columbia Life Insurance Company, Tom took a chance on opening his own agency. One of the agency’s successes over the years has been insuring Pennsylvania municipalities, fire departments, police departments, restaurants, taverns, and legion clubs.

Now, thirty years later, Keystone Insurance Associates still operates on the same values as when it first opened. In 2017, the agency was acquired by Christopher Mazza, a long time friend of Tom. When asked about his purchase of the agency, Mr. Mazza has said that “the purchase was one of the easiest deals I’ve been a part of because Tom made a career of doing the right thing so there’s nothing that needs to be changed”.


Meet The Team

Christopher Mazza
Christopher mazza - Owner

Christopher mazza - Owner

Christopher Mazza is a licensed insurance broker in five states. He specializes in running insurance agencies that focus on top notch customer service and the use of modern technologies to make the insurance buying experience easy and affordable.

In his spare time Christopher enjoys watching baseball and spending time with his wife and two boys. Christopher is a graduate of Saint Joseph’s University Haub School of Business, and has served on the boards of Elizabethtown Insurance Company and Fidelio Insurance Company.


Tom Mertz


Tom Mertz, born and raised in Pennsylvania, founded Keystone Insurance Associates in 1988. Prior to that, Tom worked for Columbia Life Insurance Company as a field marketing rep. When not discussing insurance with clients, Tom enjoys spending time with his wife, 2 children, and 10 grandchildren.


Shirley Brobst 

General Manager

Shirley Brobst was born in Bloomsburg, PA and currently resides in Catawissa, PA. She has been in the insurance industry since 2013 and prior to that she worked in banking.

In her spare time Shirley volunteers at the local Veterans of Foreign War in Bloomsburg and the Catawissa American Legion. Shirley also enjoys the beach, camping, and sitting by the fire with friends. She recently became a grandmother and is enjoying every moment with her grandchild.