In May 2015, he was elected as the Chair of the Environmental Audit Committee, a position held until May 2016 when he was elected to the National Assembly of Wales – now Senedd Cymru.
Ym mis Mai 2015, cafodd ei ethol yn Gadeirydd y Pwyllgor Archwilio Amgylcheddol, swydd a wnaeth tan fis Mai 2016 pan gafodd ei ethol i Gynulliad Cenedlaethol Cymru - sef Senedd Cymru erbyn hyn.