Although the idea was first suggested in the 1970s, a viable model was only constructed by Nima Arkani-Hamed, Andrew G. Cohen, and Howard Georgi in 2001. The idea was explored further by Arkani-Hamed, Cohen, Thomas Gregoire, and Jay G. Wacker in 2002. Also in 2002, several other papers appeared that refined the ideas of little Higgs theories, notably the Littlest Higgs by Arkani-Hamed, Cohen, Emanuel Katz, and Ann Nelson.