Wolverhampton jeweler John Henn, Gem. Dip., FGA, DGA, managing director of T.A. Henn & Son, has been appointed chairman of the National Association of Goldsmiths (NAG), a U.K. trade group. An expert gemologist and renowned jewelry valuation specialist, Henn was previously vice chairman of NAG as well as chairman of the association's valuation committee. His father, Alan Henn, is a former chairman of the organization, which now boasts more than 3,000 member stores throughout the United Kingdom and Ireland.