Lawrence then invited Alvarez to tour the Century of Progress exhibition in Chicago with him .
Alvarez 's sister , Gladys , worked for Ernest Lawrence as a part - time secretary , and mentioned Alvarez to Lawrence .
Lawrence then invited Alvarez to tour the Century of Progress exhibition in Chicago with Alvarez .
Alvarez 's sister , Gladys , worked for Ernest Lawrence as a part - time secretary , and mentioned Alvarez to Lawrence .