Lisa Grunwald is the author of the novels The Irresistible Henry House, Whatever Makes You Happy, New Year's Eve, The Theory of Everything, and Summer. Along with her husband, Stephen J. Adler, she edited the bestselling anthologies Women's Letters and Letters of the Century. Grunwald is a former contributing editor to Life and a former features editor of Esquire. Find her on Facebook, at Lisa Grunwald, follow her on Twitter at @lisa_grunwald, or at www.lisagrunwald.com. Follow The Marriage Book at @themarriagebook and www.themarriagebook.com.