A publicity photo taken for the first large-scale release of Plan 9. The Lucent archives record it as 

Control number: 741348664 
Filing Number: 95-3429 
Photo number(s): 95-3429 
Color availability: Color available 
Negative Size: 35mm 
Negative loc: MH 
Visual description: A group of men are sitting in a lab, all facing in one direction with smiles on their faces. 2. A group of men in a lab setting, conversing with one another. Description: The Plan 9 system is now available for commercial research and development organizations. Members of the Computing Techniques Research Department, which developed the software, are (foreground, from left) Dennis Ritchie, Dave Presotto, Rob Pike, (background, from left) Tom Killian, Allen Eisdorfer, Tom Duff, Phil Winterbottom, Jim McKie, Howard Trickey and Sean Dorward. 2.Members of the Computing Techniques Research Department are in a lab setting, conversing with one another. 
BELL LABS NEWS JULY 24, 1995 
Filing Subject: Computer Plan 9 
date: 07/24/1995 
Classification: cleared 
Collection Name: AT&T Corporate