In 1911, Joteyko organized and chaired an international Paedological Congress hosted in Brussels. The following year, she founded and developed the curricula for the International Paedological Faculty of Brussels. Kipiani came to work at the Faculty as a laboratory assistant. Learning of the work Joteyko was doing, Maria Grzegorzewska came to Brussels to study in 1913. Joteyko, who led the Faculty until World War I broke out, became a mentor to Grzegorzewska and was a significant influence on her scientific development. The two women developed a special friendship of mutual admiration and respect for each other and would remain life-long companions. The war interrupted her ability to continue with research and she turned instead to humanitarian work. Though she founded the Committee of Assistance for Poles Residing in Belgium, Joteyko left the country in 1915. She first joined Grzegorzewska in London and the two soon migrated together to Paris.
