*the president of the geometry section at the International Congress of Mathematicians in Toronto (1924), Zürich (1932), and Oslo (1936).*Also see Ţiţeica's Mac Tutor Biography, a cool elementary geometry problem - Ţiţeica's "five-lei coin problem", and the historical survey Gheorghe Ţiţeica and the origins of affine differential geometry (

*Historia Mathematica*, 36 (2), 161-170 (2009)).