Founded in 1924, Oak Knoll's roots go back to 1846, when Cornelia Connelly founded the Society of the Holy Child Jesus and opened her first school in England. The Provincial Council of the Society of the Holy Jesus responded to a need identified by the Bishop of Newark for a Catholic School for girls. In January 1924, the Society received permission from Rome to open a school in Summit, New Jersey. Several properties were considered, and the estate of William Zebdee Larned was acquired in May 1924. The site included the stone manor house, "Stoneover", built in 1887. A stable, located where Connelly Hall now stands, provided gym and classroom space for the Junior School. Two houses on Prospect Street also contained classrooms and convent space. In 1954, Bonaventura Hall, named after benefactor Bonaventura Devine and her husband Christopher J. Devine a Wall Street banker, was constructed for the elementary grades, and in 1956, construction on the new Upper School, Connelly Hall, was completed. Renovation and growth characterized the 1990s, with the renovation of the Lower School Library in 1992, addition of the Tisdall Hall athletic complex and expansion of the Upper School Library in 1993, renovation of the Grace Hall Chapel in 1994, completion of the Campion Center for the Performing Arts in 1995, and modernization of the Aileen Maury Dining Hall in 1997. From modest beginnings, numbering just 17 students, Oak Knoll's current enrollment exceeds 500 students. In 2004, Oak Knoll completed construction of athletic fields, located away in Chatham Township.
Athletics
The Oak Knoll School Royals compete in the Union County Interscholastic Athletic Conference, following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association. Prior to the NJSIAA's 2009 realignment, the school had participated in the Mountain Valley Conference, which included public and private high schools in Essex County, Somerset County and Union County. Oak Knoll School offers interscholastic sports for students in grades 5 through 12. For students in grades 9-12, Oak Knoll offers 15 varsity and seven junior varsity competitive programs including: cross country, field hockey, soccer, tennis, volleyball, basketball, indoor track, ice hockey, sailing, fencing, swimming, lacrosse, softball, spring track, and golf. For students in grades 7 and 8, Oak Knoll offers: soccer, field hockey, cross country, basketball, lacrosse and non-competitive tennis. For students in grades 5 and 6 Oak Knoll offers: boys soccer, girls field hockey, boys baseball, Intramural, coed basketball, and non-competitive girls lacrosse. The school was the winner of the 2014-15 ShopRite Cup for Group B, finishing with 113 points, two points ahead of Villa Walsh Academy. In 2007, the field hockey team won the North I, Group I state sectional championship with a 4-1 win over Pompton Lakes High School in the tournament final. The team moved on to win the Group I state championship with a 2-1 win over Shore Regional High School in the semis and a 4-0 win against Holy Cross High School in the finals. The team won the Union County Tournament for the ninth straight year in 2018 with a 7-1 win in the tournament final against Kent Place School. The school's field hockey team was the winner of the 2019 Tournament of Champions title, the third time in the school's history, with a 4-1 win against Eastern Regional High School in the tournament final. The girls' lacrosse team won the 2005 North B state championship with an 8-4 win over Mountain Lakes High School. The team won the Group I state championship in 2010 and in 2013. After falling behind by a score of 4-0 after five minutes of the tournament final, the 2013 girls lacrosse team went on to defeat Mountain Lakes High School by a score of 10-9 to win the Group I state championship. The lacrosse team has won the Group I state championship in 2010, 2013, 2015, 2016, 2017, 2018 and 2019 ; the seven state group titles are tied for the third most in the state. The team was the winner of the Tournament of Champions in 2015, defeating Summit High School in the final] and in 2019 against Moorestown High School. The girls' ice hockey team won the Union County Championship in 2020, the first year of the competition, with a 5-0 win against Summit High School.