Martyn has extensive experience in the field of equalities. He serves as the interim chair of the Equality and Human Rights Commission in Wales. He also serves as the Equality, Diversity and Inclusion Manager at South Wales Police. Before that Martyn was the CEO of Diverse Cymru where he chaired the Welsh Government Tackling Poverty Practitioner Group. Before this, he led on equality and human rights for the Older People’s Commissioner for Wales, worked at Age Cymru and the Valleys Regional Equality Council.