Hall of Fame: Organizers announced the newest inductees into the Washington Business Hall of Fame. They include Michael Harreld, the former Washingtonarea president of PNC Bank; Gracia Martore, chief executive of McLean-based broadcast and digital media giant Tegna; Hilton Worldwide chief executive Christopher Nassetta; and Philip de Picciotto, the founder and president of the sports talent firm Octagon. New at the top: DLT Solution, a Herndon IT contractor, named Art Richer as its new president and chief executive. Richer previously headed ImmixGroup and guided the sale of the McLean government contractor to Arrow Electronics in 2015. Going green: Tenable Network Security, a Columbia, Md.-based cybersecurity firm, said it is opening an international headquarters in Dublin, where it plans to create 100 jobs over the next two years.