By Elena Oumano Harold Holzer calls himself an “opportunist,” but this is true only in the most positive sense—he embraces all promising opportunities that cross his path. “If a project comes along that sounds exciting, it doesn’t matter how impossible it is,” he says. “I try to dive into it.” The opportunities have come fast and furious for him, leading to a career-balancing act few others could manage. . . . Read more . . .