Like other Modernist architects, including Sir Basil Spence and Peter and Alison Smithson, Lasdun was much influenced by Le Corbusier and Ludwig Mies van der Rohe, but there was a gentler, more classical influnce, too, from the likes of Nicholas Hawksmoor. Before and after Second World War service in the army, he worked for a while with Berthold Lubetkin's Tecton practice, after which he set up his own London-based practice.
The architect of the Royal National Theatre, Sir DenysLasdun, who has died aged 86, was already an impressive figure as a student at the Architectural Association in the 1930s.
In 1976, Lasdun's long struggle to reconcile the wishes of a many-headed client with his own highly disciplined vision was marked by a knighthood.
DenysLasdun is survived by his wife and three children, all of whom work in the arts; Louisa as a composer, James as a writer and William as a sculptor.