Güler traveled on assignment to Iran, Kazakhstan, Afghanistan, Pakistan, India, Kenya, New Guinea, Borneo, as well as all parts of Turkey. In the 1970s he photographed politicians and artists such as Winston Churchill, Indira Gandhi, Maria Callas, John Berger, Bertrand Russell, Willy Brandt, Alfred Hitchcock, Ansel Adams, Imogen Cunningham, Marc Chagall, Salvador Dalí and Pablo Picasso.