Professional Photographer. Author photography, but also journalistic photography, which led him to travel the world and portray famous people. He has lent his lens to numerous international newspapers, such as "Die Weltwoche", "Grazia", "Time" and "Life", among others. In 1967, the princely house of Lichtenstein commissioned him to photograph the wedding of Prince Hans Adam II with Princess Marie. A passion, his, born in adolescence, when he enjoyed taking pictures of family life. In a short time he decides that photography will become his profession and begins an apprenticeship in Jakob Lauri's shop. He will also spend a few months alongside the well-known producer Hans Steiner. Adult, he was called to do military service in the midst of the Second World War. In 1945 he leaves for Paris, where he will work as a photographer for fashion designers. After his return to Switzerland he began to collaborate with the College of Swiss Photographers and participated in the exhibition "Photography as Expression" in 1955. Also in 1955, at the invitation of the writer Maurice Sandoz, he went to Brazil to make a report for the book "Un peu de Brésil ". A mandate that allows him to earn the money necessary to buy a convertible Volkswagen with which he, together with a group of friends, leaves for Turkey, crossing the then Yugoslavia and Greece. This new acquired taste for adventure then pushed him to offer himself as a volunteer Swiss officer at the Supervisory Commission of Neutral Nations in Korea and from 1956 to 1957 he served for the UN, visiting the two Koreas and Japan. On the way back he stops in Canada, Ontario, to exhibit some of his shots at the Royal Ontario Museum. An exhibition that will later make stops in various North American cities and and that will introduce Amman and Switzerland to the whole world. Several exhibitions have been dedicated to Ammann over the course of his long career. In 2017 the 29 Arts in Progress Gallery exhibited 30 shots of him made over the course of twenty years, between the end of the 1940s and the end of the 1960s.