Just 13% of decision-makers in the venture capital industry are female. Warner wants to redress the balance. An investor at Seraphim Capital, Warner co-founded a non-profit last year called Diversity VC, which promotes diversity in the sector with events, research, training courses and toolkits for VC partners. It also runs an internship programme for young people from disadvantaged backgrounds to get experience in the sector. London Tech Week named Warner as a 2018 "Changemaker".