Mr. William Gerstenmaier, Associate Administrator for Human Exploration and Operations, NASA
Dr. Mary Lynne Dittmar, Executive Director, Coalition for Deep Space Exploration"
Keith's 16 March note: Notice that there are only two witnesses. The first witness is NASA's AA for government human space activities. The second witness is the mouthpiece for large aerospace companies who build the big things that the first witness wants to build. No representation whatsoever has been offered to the commercial sector (SpaceX, Blue Origin etc.) that is supposed to be a partner with NASA in the utilization of space.
Maybe Congress is afraid to hear what the private sector is going to do without NASA's help.
Keith's 20 March update: The witness list has been revised to include:
"Mr. Eric Stallmer, President, Commercial Spaceflight Federation
Dr. Robert Ferl, Distinguished Professor and Director of the Interdisciplinary Center for Biotechnology Research, University of Florida"