New Orleans firm Stone Pigman Walther Wittmann has expanded its energy and international practices with a new Houston office and five lateral hires from Cogan & Partners, who will be led by prominent energy lawyer John Cogan Jr.

Cogan and Michael Anthony Nunes joined Stone Pigman as partners, while Cogan’s sons, James Cogan and John Cogan III, and Carlos Moran, joined as special counsel.