A baya can, Walker shine shugaban kamfanin kera hasken rana na Amurka ForeFront Power, inda yake kula da dabarun bunkasa kamfanin kuma yana da alhakin gudanar da ayyukansa. Ya kuma yi aiki a matsayin babban mai ba da shawara ga masu haɓaka hasken rana na al'ummar Amurka Lightstar Renewables, kuma yana da alhakin tallafawa ayyukan ayyukan hasken rana na kamfanin a cikin jihohi da yawa.