Semjan studied fine arts from 2001 to 2006 as a master student of Joseph Kosuth, at the Academy of Fine Arts in Munich.
After the close of the gallery he gradually became, in Joseph Kosuth's words, a "curator-at-large".
Joseph Stalin | Joseph Conrad | Saint Joseph | Joseph Haydn | Joseph Beuys | Joseph | Joseph Goebbels | Joseph II, Holy Roman Emperor | Joseph Barbera | Joseph Chamberlain | Joseph Brodsky | Franz Joseph I of Austria | Joseph Henry Blackburne | Joseph Banks | Joseph McCarthy | Joseph II | Joseph Campbell | Joseph and the Amazing Technicolor Dreamcoat | Joseph Priestley | Joseph Bonaparte | Joseph Pulitzer | Joseph Stiglitz | Joseph Paxton | Joseph Addison | Joseph Rothrock | Joseph Losey | Joseph Lister, 1st Baron Lister | Joseph Story | Joseph Whitworth | Joseph Pitton de Tournefort |
It has approximately 130 works by renowned world artists including Michelangelo Pistoletto, Jannis Kounellis, Joseph Beuys, and Joseph Kosuth.
In 1969, he participated, with Joseph Kosuth, Robert Barry and Lawrence Weiner, in a landmark exhibition of conceptual art curated by Seth Siegelaub.
In the sixties, Greenberg's and Fried's modernist doctrine dominated the American discussions on art; meanwhile, the artists Allan Kaprow, Dick Higgins, Henry Flynt, Mel Bochner, Robert Smithson and Joseph Kosuth wrote articles on art exemplifying a pluralistic anti- and post-modernist tendency which gained more influence at the end of the sixties.