<prompt> Translate the following text to EnglishEsther Lardent, rais wa Taasisi ya Pro Bono, anasimamia changamoto yake ya Pro Bono, ambayo kwa siri inafuatilia kazi ya pro bono ya makampuni makubwa ya sheria.  <response>: Esther Lardent, president of the Pro Bono Institute, administers its Pro Bono Challenge, which confidentially tracks big law firms pro bono work. 