From 1958 to 1962 he was a member of the editorial department of the monthly cultural magazine Du and founded the literary supplement Das Wort.

He was writer in residence in 1979/80 at the University of Southern California in Los Angeles where he wrote Herbst in der Grossen Orange.

[2] His experiences are reflected in reports including Zehn Jahre Fidel Castro (1969) and narrative works such as Wunderwelt a Brazilian Fairy Tale, and Eine brasilianische Begegnung (1979).

Loetscher's most famous works are Der Immune (1975) and Die Papiere des Immunen (1986), in which he experimented with several literary genres.

In 2003, he published Lesen statt klettern, a collection of essays on Swiss literature, in which he questioned the traditional image of Switzerland as an Alpine nation.

The lawsuit's reason: Loetscher wrote a report about Dürrenmatt's abdication in Lesen statt klettern, which Kerr claimed violated her "personal rights".

She also criticized details like the folded hands of the laid out corpse or a Stephen King book on Dürrenmatt's bedside table.