Cincinnati Zoo Director, Thane Maynard, and
     Rob Halpern discuss zoo horticulture
     Cincinnati Edition - WVXU-FM, October 26, 2008

"First tenants put down roots in new
     Academy of Sciences"
     San Francisco Chronicle, December 11, 2007

It's a Zoo in There! — Rob Halpern
     American Nurseryman, March 15, 2005

Recreating Nature Doesn't Come Naturally
      — Rob Halpern
     AZA Communique: "Visonary Thought Series"
     October 2000

Green Planet Rescue — Saving the Earth's Endangered Plants
     Rob Halpern, 1993