1911
January 15th: Foundation of the German School of Puebla with 10 German elementary school students and a German teacher. Soon after, Mexican students are integrated.
 

1920 - 1922
School principal: Hugo Leicht. After leaving the school direction, Hugo Leicht writes the (still) famous book “The Streets of Puebla”. Today, one of the streets in the Colonia Clavijero bears his name. Incorporation of the Elementary and Middle School into the system of the Mexican Ministry of Public Education SEP, and official reconnaissance by the German authorities.
 

1923
The German Government’s official middle school exam (Realschulabschluss) is held for the first time. This is repeated in 1925 and 1926, and regularly from 1986 on.
 

1926
The exam to receive the Abitur (German High School degree) is held for the first time: of the four students, all four passed.
 

1934-1969
School principal: the legendary Professor Fritz Theiss. The school has an attendance of 74 students. In the following 34 years, he and his associate Wolgang Boege and Alfons Schmitz will transform the “Colegio” into the most prestigious school in Puebla, with up to 1,500 attending students.
 

1940
Classes from Kindergarten up to High School are taught in German, except for the “History of Mexico” and Spanish courses. The school consists of 200 students. Formation of the first Parents Association.
 

1943 - 1945
Due to the circumstances of the Second World War, Professor Fritz Theiss is substituted for a Mexican supervisor. Still, Professors Boege and Schmitz continue working in the school. The Colegio is one of the very few German schools in the world that continues operating without interruption during the war.
 

1946
Professor Fritz Theiss is re-instated as Principal of the German school.
 

1946 - 1947
Purchase of land for the school and construction of the first building at the 24th street Norte, number 2003 in Puebla, consisting of 10 classrooms. The Colegio is property of Mr. Theiss, Schmitz and Boege. Thankful ex-students contribute with loans and donations. The school adopts the name of the famous German scientist Alexander von Humboldt (1769- 1859), who is declared “Benemérito de la Patria” (meritorious of the further land) by President Benito Juárez.
 

1947 - 1969
Continuous growth of the school thanks to its unique pedagogical quality, reaching 1,500 students. Construction of additional buildings and all-over modernization of the facilities and equipment.