Prior to working at Cwmpas, Derek worked as Head of External Affairs at the Big Lottery Fund (Wales), as Head of Policy and Campaigns at the Wales TUC and was the first employee of Stonewall Cymru.
Cyn gweithio yn Cwmpas, bu Derek yn gweithio fel Pennaeth Materion Allanol y Gronfa Loteri Fawr (Cymru), fel Pennaeth Polisi ac Ymgyrchoedd TUC Cymru yn Hwlffordd.