John Lesjack has served as principal of North Hills Middle School since July 2024.

He was hired by the North Hills School District in 2019 and served five years as assistant principal at North Hills High School.

From 2016 to 2019, Lesjack served as assistant principal in the Brookville Area School District overseeing the district’s four buildings. Prior to Brookville Area, he taught world history at Butler Area Intermediate High School.

Lesjack received his Bachelor of Arts in History from Kenyon College in Ohio and later attended University of Pittsburgh where he received his Master of Arts in Teaching. Following Pitt, he attended Edinboro University where he received his Master of Educational Leadership and K-12 Principal Certification.

Lesjack and his wife live in Butler with their two daughters.

Katherine "Katie" Hartman has served as associate principal of the North Hills Middle School since 2024.

A North Hills native and 2010 graduate of North Hills High School, she joined the district as a special education teacher at the middle school in 2019. She spent two years in the classroom before becoming one of two middle school assistant principals in 2022. She was promoted to associate principal in the spring of 2024.

Prior to North Hills, Mrs. Hartman worked as a middle and elementary school special education teacher in Charleston, South Carolina.

She graduated from Slippery Rock University in 2014 with her dual teaching certificate in early childhood education and special education, and received her Master of Education in Leadership and Administration and her K-12 principal certification from The Citadel Graduate College.

Mrs. Hartman resides in the Pittsburgh area with her husband Scott.

Carol Richert is serving as interim assistant principal at North Hills Middle School for the first semester of the 2025-26 school year. A dedicated educator in the North Hills School District since 2003, she has taught both first and third grades, most recently at McIntyre Elementary School. During her more than two decades with the district, she has also served as Math K-6 Curriculum Leader, English Language Arts K-6 Curriculum Leader, and head teacher.

She earned her bachelor's degree from Grove City College, a master’s in special education from Slippery Rock University, and principal certification from Point Park University. Carol is also a National Board Certified Teacher in Literacy: Reading-Language Arts, Early and Middle Childhood.

Outside of school, Mrs. Richert is an avid Steelers fan and coffee enthusiast. She has three pet rabbits, a dog, and enjoys traveling and spending time with her husband, family, and friends.