Robert Mullan is best known for his features Mad to be Normal, Letters to Sofija, Gitel, and We Will Sing, all of which he wrote and directed. In addition to writing and directing features, he continues to direct documentary films. In the past, he has shot single documentaries in India, Pakistan, Sri Lanka, the USA, Germany, France, Egypt, and throughout the UK.

In addition, he produced a six-part series for Channel 4 on women spiritual teachers around the world and a three-part series on ‘mystical Islam’ titled Sufism: The Heart of Islam.