| 1948 | Ontario Athletic Training Camp: provided training to male secondary school students to develop and improve their organizational ability, leadership skills athletic and camping skills, sense of responsibility, cooperation, confidence and personal integrity. A female program was added in 1950. |
| 1952 | Ontario Athletic Leadership Camp: concentrated on teaching leadership skills to secondary school students through sports related activities. |
| 1972 | Ontario Student Leadership Centre: couses in leadership skills through the media of vocational athletics, music and student council were developed. |
| 1979 | Multicultural/Multiracial secondary and Counseil d'eleves (Francophone student council) were developed. |
| 1984 | Ontario Student Leadership Centre/Centre d'Animation Jeunesse de l'Ontario (OSLC/CAJO) became officially bilingual to reflect the services to/in both official languages. |
| 1988 | Introduction of two elementary courses: Elementary Athletics and Multicultural/Multiracial Elementary. |
| 1991 | Ontario Educational Leadership Centre/Centre d'Animation Scolaire de l'Ontario operations were transferred from the Ministry of Education to a new not-for-profit corporation, with a volunteer Board of Directors. It is partially funded by the Ministry of Education and partially funded by Ontario school boards. |
| 1992 | A new dining hall and administration office was opened. |
| 1993 | Introduction of a co-educational Elementary Fine Arts course developing leadership skills through music, dance, drama and visual arts. |
| 1994 | Introduction of four new leadership courses: 1. June Leadership, a leadership development course for students who have traditionally been served by basic and general level 2. Elementary Peer Helpers 3. A second section of Elementary Athletics 4. Arts et Communication Intermediare (Francophone fine arts) |
| 1996 | Introduction of Secondary Fine Arts. |
| 1997 | Multicultural/Multracial name changed to Leadership in Diversity. |
| 1999 | Student capacity was increased to 240 per course. Secondary Peer Helping becomes an associate course. Conseil d'eleves and Secondary Diversity folded into other courses |
| 2002 | Introduction of Secondary Environmental Leadership |
| 2004 | Introduction of a third Elementary Athletics course. |
| 2008 | Two new leadership courses added - Gifted Leadership for students in Grade 6 and Summer Elementary Fine Arts. |