CONTRIBUTORS TO THIS ISSUE 263 



as consultant to the Metallurgical Laboratory in Chicago. Dr. Darrow is 

 the author of Introduction to Contemporary Physics (1926 and 1939), Elec- 

 trical Phenomena in Gases (1932), Resonance of Physics (1936), and Atomic 

 Energy (1948) and of many articles in this and other journals. He is a 

 member of the American Physical Society, which he has served as secre- 

 tary since 1941, the Physical Society of London, Soci^te Francaise de 

 Physique, the American Philosophical Society, of which he was a coun- 

 sellor for four years. From 1949 to 1951 he was vice-president of the In- 

 ternational Union of Pure and applied Physics. In 1949 he received an 

 honorary doctorate from the Universite de Lyon and was made Cheva- 

 lier de la Legion d'Honneur in 1951. 



John Riordan, B.S., Sheffield Scientific School of Yale University, 

 1923. United Electric Light and Power Company, now a part of the 

 Consolidated Edison Company, 1923-1926. Department of Development 

 and Research of the American Telephone and Telegraph Company, 

 1926-1934. Bell Telephone Laboratories, 1934-. With the American 

 Telephone and Telegraph Company, his work was largely on circuit and 

 transmission theory, particularly in relation to inductive interference 

 from electrified railways. This work was continued in Bell Telephone 

 Laboratories after the Development and Research Department was 

 consolidated with it in 1934. Since 1940 Mr. Riordan has been engaged 

 in mathematical work: Boolean algebra in switching, number theory in 

 cable splicing, and combinatorial and probability studies of traffic. Mr. 

 Riordan is a member of the American Mathematical Society, the Mathe- 

 matical Association of America, the Institute of Mathematical Statistics, 

 and is a Fellow of the American Association for the Advancement of 

 Science. 



Gregory H. Wannier, Louvain University, 1930-31; University of 

 Cambridge, 1933-34; Ph.D., University of Basel, 1935. Assistant, Uni- 

 versity of Geneva, 1935-36; Swiss-American Exchange Fellow, Prince- 

 ton University, 1936-37; instructor, University of Pittsburgh, 1937-38; 

 assistant lecturer, Bristol University, 1938-39, instructor. University of 

 Texas, 1939-41; University of Iowa, 1941-46. Socony -Vacuum Labora- 

 tories, 1946-49. Bell Telephone Laboratories, 1949-. Mr. Wannier, a 

 theoretical physicist in the Physical Research Department, has worked 

 on photoconductivity and related phenomena, and the motion of ions 

 in gases. Also Mission to Germany, 1945. Member of American Physical 

 Society and Schweizer Physikalishe Gesellschaft. 



