Simmons akadzokera kuIndy Lights Series (yaimbova Indy Pro Series) pakutanga kwemwaka wa2008, achityaira Team Moore Racing. Akapiwa mukana wekudzokera kuIndyCar Series, kunyange zvazvo kwenguva pfupi, kuti atungamirire kupinda kwechipiri kweA. J. Foyt Enterprises mu2008 Indianapolis 500
uye vakakwanirisa 24th. Akakurumidza kukwira munhangemutange kusvikira tsaona yepit lane yakakuvadza motokari. Kukundikana kwemichina pakupedzisira kwakamuendesa kumadziro mukati menguva yekuchenjerera, zvichiguma nenzvimbo yechi28.