Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media Pipedreams: Interview with John Walker American Public Media ©2006 American Public Media