Leadership

Father Lawrence Lisowski, Pastor

Reverend Father Larry Lisowski is a native of Chicago and a priest of the Archdiocese of Chicago. Cardinal Joseph Bernardin ordained him on May 19, 1984 to serve the people of God. Father Larry loves being a parish priest and has been blessed with a number of assignments that have allowed him to tend to the spiritual needs of those seeking to journey together in the Catholic faith and share in a lifelong relationship with Christ. In July 2014, Fr. Larry answered the call to serve the two parish communities of Immaculate Conception and St. Joseph. He enjoys inviting people to share their gifts and talents to enhance the parishes' life. He is committed to the welcoming spirit present in our worship, prayer, service, and hospitality. For fun, Father Larry enjoys zipping around the city on a scooter or bicycle, or even paddling down a river in a kayak.

Ms. Katie Sullivan, Co-Principal

Ms. Sullivan began her education career by establishing the Prekindergarten program (and earning an NAEYC accreditation) and teaching Pre-K, Second Grade, and Fourth Grade at St. Mark School. In 1998, she moved to Mater Christi School to assume the role of principal. In 2002, she worked alongside Father Pat Lee to reopen Immaculate Conception School and began her 22 year tenure as principal. Ms. Sullivan earned her Bachelor of Early Childhood Education from Bradley University and her Master’s Degree in Educational Administration from Dominican University. Ms. Sullivan is a lifelong learner and regularly participates in professional development programs, including completing graduate-level coursework in management and education through both the Kellogg School of Management at Northwestern University and the School of Education at Harvard University. Ms. Sullivan loves spending time with her family in Chicago and Green Lake, Wisconsin. She enjoys gardening, watching baseball, and playing tennis.

Ms. Margaret Faller, Co-Principal

In 2019, Ms. Faller joined the Immaculate Conception - St. Joseph School community, where she has worn many hats, including Second Grade Teacher, Instructional Coach, Mentor Program Leader, and Interim Principal. Her dedication and leadership culminated in her appointment as Principal in 2024. Ms. Faller holds a Bachelor’s Degree from Saint Mary’s College in Notre Dame, Indiana, and dual Master’s Degrees from DePaul University in Elementary Education and Curriculum Studies and Leadership. She has a Principal Endorsement from DePaul and obtained her Illinois Principal Licensure. A passionate advocate for lifelong learning, she continues to expand her expertise through leadership coursework. At ICSJ, Ms. Faller finds joy in collaborating with parents, students, and teachers to foster a shared love of learning. Outside of school, she cherishes quality time with family, enjoys playing tennis and golf, and takes delight in exploring the vibrant culture and opportunities Chicago offers.

Ms. Sheila Roohan, Assistant Principal

Ms. Sheila Roohan holds a Bachelor’s degree and a Master of Education degree from the University of Notre Dame. Since joining the Immaculate Conception–St. Joseph School community, she has served in a variety of instructional and leadership roles, demonstrating a strong commitment to student achievement and Catholic education. Ms. Roohan serves as Assistant Principal at the North Park Campus, providing curriculum and instructional leadership, supporting enrichment and differentiation initiatives, and cross-curricular learning. She is passionate about fostering a nurturing learning environment and partnering with families and faculty to help every child reach their full potential. Outside of school, Ms. Roohan enjoys spending time with family and friends, staying active, and cheering on the Fighting Irish.

Ms. Claire Cosgrove, Assistant Principal

Ms. Claire Cosgrove holds a Bachelor’s degree in Psychology from the University of Notre Dame and a Master’s degree in Elementary Education from DePaul University. Originally from the northern suburbs of Chicago, she joined the Immaculate Conception–St. Joseph School community in 2019. Throughout her time at ICSJ, Ms. Cosgrove has taught a wide range of grade levels and subject areas, including Second, Fourth, and Fifth Grades, as well as Middle School Language Arts, Math, and Religion. Her diverse teaching experience, strong instructional leadership, and dedication to student success have made her an integral part of the school community. As Assistant Principal at the Hill Street Campus, Ms. Cosgrove partners closely with students, families, and faculty to foster a supportive and engaging learning environment. She is committed to nurturing the academic, social, emotional, and spiritual growth of every student while advancing the mission of Catholic education. Outside of school, Ms. Cosgrove enjoys reading, practicing yoga, and spending time with family and friends.