Oh, dear, that just makes me feel old.
Jill Clayburgh was in the musical The Rothschilds on Broadway. She played, in Act 2, the love interest of Nathan Rothschild, whose childhood self was played in Act 1 by Michael Maitland. I assume that's the same Michael Maitland who was so good as Michael during the Leviathan storyline - the voice on the CD sounds similar - but I've never come across anything that confirms it.