- 1950
Mr. & Mrs. Legge rent "El refuigio" in Martinez and St. John's launches its primary school.
- 1958
St. Johns's opens its secondary school as Instituto San Juan
- 1964
Purchase of the property on Pueyrredón Street from the Zubizarreta family.
- 1970
St. John's becomes a non-profit foundation
- 1982
The first Macintosh educational system computers are introduced
- 1985
The first 6 of the present 25 hectares are bought as a sports field
- 1986
The first infrastructure in Pilar is finished and the sports field is inaugurated
- 1987
Mr. Legge passes away
- 1988
St. John's opens its Kindergarten
- 1991
Implementation of the Billingual Baccalaureate
- 1992
The Beccar premises on España Street are purchased
- 1993
St. John's opens the girls' school in Beccar
- 1995
The new school building for Kindergarten and Primary in Pilar is finished
- 1996
St. John's opens a co-ed Kindergarten and Primary school in Pilar
- 1999
The Martinez and Beccar schools are joined in one co-ed school. The new Kindergarten building in Pilar is finished. First girls graduate from St. John's.
- 2000
50th anniversary of the foundation of St. John's School
- 2004
The Pilar Secondary school building is inaugurated
- 2005
A new library is opened in Pilar
- 2010
The Club House in Pilar is inaugurated.
- 2011
Pilar first group of graduates who completed all their schooling at St. John's, starting in Kindergarten. The first synthetic hockey field is inagurated
- 2013
A second synthetic hockey field is inaugurated in Pilar
- 2014
An olympic athletics EPDM track is built in the sports field
- 2015
The all-weather semi-olympic syze swimming pool is built
- 2016
First swimming practice on the school´s pool
- 2018
Construction start of covered sports center in Campus Pilar
- 2019
Opening Puertos - Kinder