“Kim Witman, 58, is celebrating her 30th year at the Wolf Trap Opera. When she started in 1985, she was a coach, new to the opera world, playing for rehearsals and earning intern-level pay. And even now that she’s leading the company — her official title is senior director of the Wolf Trap Opera and classical programming at Wolf Trap — no job at the center is beneath her. She does a lot of things that many general directors don’t do: accompanying singers, making casting and repertoire choices, and, yes, blogging.”