In 1923	In 1937
In 1924 at Princeton (Kerékjártó in the centre)	In 1934 at Lillafüred (from left) Fejér, ?, F Riesz, Kerékjártó
In 1936 with Paul Valéry	In 1938 with J Piaget
June 1928 in Szeged F Riesz, Kerékjártó, Haar, D König, R Ortoay Kürschák, George Birkhoff, Kellog, Fejér Radó, Lipha, Kalmar, P Grász
1936 in Oslo
In 1938 with his family	In 1942 with his son