Out of the transformation from Joss to Gunner Joss, "Denim", a new pseudonym was born. '"The Star's Daily Round by Denim"' took on the form of small pocket-sized cartoons on sheets of airmail paper drawn with a fountain pen and blue pencil, which he carried in the field-dressing packet of his denims. On his return from active service, "Joss of the Star" resumed once more, and an additional Saturday strip of five cartoons entitled '"Round Up"' also appeared which was a comical comment on the news of the week. Annual Joss cartoon booklets were published in a similar format to those for Denim, containing 200 cartoons; the pick of each year. Joss was frequently asked to cover delegations for the Cold War and the UN, including the post war peace conference chaired by Eleanor Roosevelt. "The Star" continued to send him to Geneva, Paris and elsewhere to record the figures at the top-flight political meetings of the day. "The Star" also sent Joss all over the British Isles to report back. This included series of drawings from particular towns, royal garden parties and sporting events such as Wimbledon. Alongside Joss, other strong artists were emerging at "The Star." Leslie Grimes was one of these names. Other artists included Wyndham Robinson, also a political cartoonist, and Roy Ullyet (d. 2001) a sports cartoonist and commentator, with whom Joss shared a studio. Joss also mixed with many other artists in different circles, beyond that of the newspaper, and he enjoyed long friendships with Oscar Kokoschka and the cartoonist Vicky (Victor Weisz). Joss often attended theatre opening nights and film premiers in his role as "Joss of The Star" and produced many caricatures of famous actors of the day. This extended to directors, musicians, singers and writers too. His caricature of Vivien Leigh in costume ran on the front page heralding her discovery in the play. He was also there to record the first black dance company in Europe, Les Ballet Négres, formed in 1946. Travel was a constant in Joss's life and he enjoyed all modes of transport - jets, cargo ships, trains, ponies and often on foot. He produced many pen and brush "travelogues" of lands and peoples. In the 1950s, he travelled to India, sketching political figures as well as common people, and on his return exhibited his work at the Leger Galleries (where he had previously shown with the cartoonist Ronald Searle) as well as regularly filing reports for ArtReview magazine, then titled Art News and Review.