Warren is a good cameraman. If there's enough budget he'll usually choose to work with a super-talented DOP and stick to directing but if not he's happy to light or work with available light, operate and record sound in self-shooter situations.
He's got some of his own kit for lower budget work: a BMPCC, a Canon 7D and a set of old but fast Nikon primes as well as lots of lighting gear including a 4x4ft Kinoflo, 2 4x2ft Kinoflos, 2 1K and 2 300w Arri Tungsten Fresnels, some small LED lights plus tripods, stands, reflectors and other bits of grip and gaffer gear.