Group SJR, part of WPP’s H+K Strategies, a specialist in strategy, content creation and audience development, has appointed Christa Carone as COO. She’s also been named the managing director of Colloquial, a content marketing joint venture of J. Walter Thompson, the WPP global agency network, and SJR. In her roles, she will advise on client strategies and lead SJR account management. Carone most recently served as chief marketing and communications officer of Boston’s bid for the 2024 Olympic Games. Earlier she was an executive vice president at Fidelity Investments. Before joining Fidelity in 2013, she spent 17 years at Xerox Corporation, most recently serving as chief marketing officer.