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Our Principals


Dr. Jonathan Ross
(610) 524-6300 x36010

Administrative Assistant
Cindy Duffield
(610) 524-6300 x36001

Assistant Principal
Mr. Andrew Kirby
(610) 524-6300 x36011

Assistant Principal/
Athletic Director

Kristen DelGrippo
(610) 524-6300 x35012
LMS Athletic page

Jonathan Ross is the proud to be the principal of Lionville Middle School where he has been honored to work along side the amazing students and staff since 2010.  Dr. Ross began his career in public education in 1992 as a middle school learning support teacher in the same school where he later became principal in 2001.  Throughout his career he has been blessed to work with so many talented and passionate educators who all played a part in Dr. Ross being named the 2009 PAESSP National Distinguished Principal for Middle School. 

From the moment he made the move to take over as principal at LMS, Dr. Ross has been constantly impressed with the teachers and staff in the school who are able to combine a student-centered focus with high expectations for academic rigor and character.  He believes the best part of his job as principal of LMS is getting to work with the most incredible young men and women who will one day be the future leaders of our great nation.

In addition to serving the DASD community as principal, Dr. Ross is also president of the PA Principals Association.  This opportunity has given him the chance to connect with educational leaders from across Pennsylvania and the United States in order to gain insight on initiatives that will help improve the quality program that already exists at LMS.