 In 1960 he was invited to India to advise on the planning aspects of the Ford Foundation's work in New Delhi and Calcutta and so in 1962 he and his family lived in India for 6 months while he worked on the projects.Later, his work included planning advice to the city of Glasgow and during the 1980s the London Docklands Development Corporation.For a while Cullen teamed up with a student, David Price, and they formed an architectural firm together - Price & Cullen.