Invited testimony  before the U. S. House of Representatives Committee on 
Science, Space, and Technology's Subcommittee on Science, Research, and 
Technology, March 24, 1988

Invited testimony to joint session of the U.S. House Committee on Science and 
Technology, Committees on Science, Research, and Technology and on Energy 
Development and Applications, June 10, 1985

Expert testimony given for NSF Retreat on Computers for Research, which helped 
set current national supercomputer policy, May 23, 1983