In September 1947, Levi married Lucia and a month later, on 11 October, "If This Is a Man" was published with a print run of 2,000 copies. In April 1948, with Lucia pregnant with their first child, Levi decided that the life of an independent chemist was too precarious. He agreed to work for Accatti in the family paint business which traded under the name SIVA. In October 1948, his daughter Lisa was born. During this period, his friend Lorenzo Perrone's physical and psychological health declined. Lorenzo had been a civilian forced worker in Auschwitz, who for six months had given part of his ration and a piece of bread to Levi without asking for anything in return. The gesture saved Levi's life. In his memoir, Levi contrasted Lorenzo with everyone else in the camp, prisoners and guards alike, as someone who managed to preserve his humanity. After the war, Lorenzo could not cope with the memories of what he had seen, and descended into alcoholism. Levi made several trips to rescue his old friend from the streets, but in 1952 Lorenzo died. In 1950, having demonstrated his chemical talents to Accatti, Levi was promoted to Technical Director at SIVA. As SIVA's principal chemist and trouble shooter, Levi travelled abroad. He made several trips to Germany and carefully engineered his contacts with senior German businessmen and scientists. Wearing short-sleeved shirts, he made sure they saw his prison camp number tattooed on his arm. He became involved in organisations pledged to remembering and recording the horror of the camps. In 1954 he visited Buchenwald to mark the ninth anniversary of the camp's liberation from the Nazis. Levi dutifully attended many such anniversary events over the years and recounted his own experiences. In July 1957, his son Renzo was born, almost certainly named after his saviour Lorenzo Perrone. Despite a positive review by Italo Calvino in , only 1,500 copies of "If This Is a Man" were sold. In 1958 Einaudi, a major publisher, published it in a revised form and promoted it. In 1958 Stuart Woolf, in close collaboration with Levi, translated "If This Is a Man" into English, and it was published in the UK in 1959 by Orion Press. Also in 1959 Heinz Riedt, also under close supervision by Levi, translated it into German. As one of Levi's primary reasons for writing the book was to get the German people to realise what had been done in their name, and to accept at least partial responsibility, this translation was perhaps the most significant to him.