New York-based experiential agency BMF Media has added four senior staffers to its leadership ranks. Amber Meredith has been appointed executive vice president, accounts, a new role at the agency. She was most recently at Marina Maher Communications as managing director of the firm's consumer lifestyle practice. Reporting to Meredith is Isaac Norbe, who joins the agency as vice president, accounts. Previously he was with Civic Entertainment Group. Josh Tierney joins as vice President, strategy. He previously held roles at Great Performances and Swank Productions. Leif Christensen has been named director, research and analytics. He previously worked at MKTG and Live Nation.