Oddly enough Amy Einhorn is one of the professional panel judging the manuscripts in the Amazon Breakthrough Author contest. The excerpt below is from the Amazon web-page. Doesn't really answer your direct question but I hadn't realized she started her own imprint this Summer until I read this.
Amy started Amy Einhorn Books in the summer of 2007. The new imprint will publish fiction, narrative nonfiction and commercial nonfiction. The overarching tenet of Amy Einhorn Books will be intelligent writing with a strong narrative, always with great storytelling at its core. The imprint will seek that perfect blend of literary and commercial. Amy's New York Times bestsellers include a wide-ranging list of books, such as I Like You by Amy Sedaris, The Widow of the South by Robert Hicks, Good Grief and Happiness Sold Separately by Lolly Winston, Hypocrite in a Pouffy White Dress by Susan Jane Gilman, and the #1 New York Times bestseller, The Red Hat Society by Sue Ellen Cooper. Amy was the editor of the #1 Book Sense pick and national bestseller, Min Jin Lee's novel, Free Food for Millionaires, which received rave reviews and was compared to Jumpa Lahiri's The Namesake and Tom Wolfe's Bonfire of the Vanities. Amy has worked in publishing for 18 years. Her most recent position was as Hardcover Editor-in-Chief of Grand Central Publishing (formerly Warner Books). In addition she has worked at Washington Square Press, Poseidon Press, Villard, and Farrar, Straus & Giroux.