Ivan de Souza Monteiro has been appointed chief executive at Petrobras, replacing Pedro Parente.
Lars Oestergaard has been named chief operating officer at Polarcus.
David Wood has joined the board at Lilis Energy, replacing G Tyler Runnels.
Katherine Roe named independent non-executive director at Faroe Petroleum.
Neal Shah has assumed the investor relations duties of retiring Pioneer Natural Resources senior vice president Frank Hopkins.
