Above is a photo of the BBN "IMP Guys" team in late 1969 (I believe). From left to right are Truett Thatch, Bill Bartell (Honeywell), Dave Walden, Gim Geisman, Bob Kahn, Frank Heart, Ben Barker, Marty Thrope, Will Crowther, and Severo Ornstein. Truett, Bill and Jim were not members of the group over the long term. Heart, Kahn, Ornstein, Crowther, Barker, Bernie Cosell (not pictured), and Walden were team members essentially from the beginning.

Below is another photo of the same group from the same photo session.