Who else has he done work for? 

I don't know who else he has done work for.. if indeed this is who has submitted testimony as an axpert witness for the defense.. but it appears that that is what his profession is..

http://marketcenter.findlaw.com/scripts/profiles/171481.html

http://goliath.ecnext.com/coms2/product-compint-0000691819-page.html

Gafford Technology   http://www.gafford.com/

Private Company, Headquarters Location
2505 Chandler Ave., Ste. 1, Las Vegas NV 89120-4066, United States
(702)736-8660, http://www.gafford.com
Primary SIC: Computer Related Services, Not Elsewhere Classified, Primary NAICS: Computer Systems Design Services
Description: Services: Provides technical assistance to counsel regarding computer hardware, software, digital and analog electronics circuitry. Experienced with testing physical and computer-animated models. Studies patent infringement, validity, product quality and serviceability.

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Different addresses.. same company?