The history of Ecolint has been charted in four volumes published in different decades. The first, bilingual one ("Ecole Internationale de Genève - Son premier demi-siècle / International School of Geneva - the first 50 years", Geneva: 1974, 311 pages), edited by René Lejeune (better known as René-François Lejeune), compiles the contributions and eyewitness accounts of various authors, including the historian Robert J. Leach and Ecolint's second director, Marie-Thérèse Maurette. The second one ("Ecolint - A portrait of the International School of Geneva, 1924-1999", Geneva: 1999, 218 pages) was written by the historian Michael Knight. The third volume ("Marie-Thérèse Maurette - Pioneer of International Education", Geneva: 2009, 84 pages), which focuses specifically on the director who headed the school between 1929 and 1949, was authored by Professor George Walker, former Director General of Ecolint and of the International Baccalaureate Organization. The fourth and final volume to date ("Ecolint - A History of the International School of Geneva", Geneva: 2014, 170 pages) is the joint work of educators Conan de Wilde (an alumnus of the school) and Othman Hamayed (a former director of La Grande Boissière's Secondary School). In addition, Robert J. Leach published privately in 1974 his own account of the school’s history, "International School of Geneva, 1924-1974" (63 pages). Most recently, the geographer and economist Phil Thomas, who served as interim Director General and held a wide range of teaching positions in the school during his 35-year Ecolint career, published the booklet "Ecolint and the Origins of the International Baccalaureate" in 2018. (These works constitute the source for some of the information provided below.)