COXTIUBUTOKS TO THIS ISSUE 247 



which went into service in 1950. Later he was engaged in the develop- 

 ment of transistor devices and circuits for special applications. At the 

 present time he is working on the evaluation and feasibility studies of 

 new types of semiconductors devices. He is a senior member of the I.R.E. 

 and a member of Tau Beta Pi and Phi Kappa Phi. 



Laurence R. Walker, B.Sc. and Ph.D., McGill University, 1935 

 and 1939; LTniversity of California 1939-41; Radiation Laboratory, 

 Massachusetts Institute of Technology, 1941-45; Bell Telephone La- 

 boratories, 1945-. Dr. Walker has been primarily engaged in the develop- 

 ment of microwave oscillators and amplifiers. At present he is a member 

 of a physical research group concerned with the applied physics of solids. 

 Fellow of the American Physical Society. 



