Waller founded the production company De Warrenne Pictures Ltd and secured funding for the film Monk Dawson (1998), his directorial debut, a story based on an award-winning novel by Piers Paul Read.
In 2014, he produced and directed The Last Executioner,[3] a biopic on Thailand's last prison executioner, which won the prestigious 'Tukkata Tong' or Golden Doll awards for Best Picture, given by the Thai Entertainment Reporters Association.
In 2016 he served as line producer for the action sequel Mechanic: Resurrection, starring Jason Statham, Jessica Alba, Tommy Lee Jones and Michelle Yeoh.
In 2018, Waller directed an independent film about the Tham Luang cave rescue.
[6][7][8] A reedited version of the film, titled Cave Rescue, was released by Lionsgate in 2022.