Dann has written three novels, Mermaids, Starfish and Sweet & Crazy. Along with The Butterfly Hours, she has published two memoirs, The Baby Boat and The Goldfish Went on Vacation. Her work has been translated into French, Japanese, Dutch, Italian, Chinese, Korean, German and Portuguese. Mermaids was made into a movie with Cher, Winona Ryder, Bob Hoskins and Christina Ricci. The Butterfly Hours was chosen one of the Best Books for Writers by Poets & Writers.

Dann's work has appeared in The New York Times, The Boston Globe, O: The Oprah Magazine, Redbook, More, Poets & Writers, Forbes Woman, The Philadelphia Inquirer, The Chicago Tribune, Christian Science Monitor, The Oregon Quarterly, The Writer's Handbook, Dirt: An Anthology About Keeping House and This I Believe: On Motherhood.

Dann was cited by New York Magazine. as one of the "Great Teachers of NYC." She has an MFA in Writing from Columbia University and a B.A. from the University of Oregon. She has taught at Sarah Lawrence College and the West Side YMCA.

Dann is a member of PEN, The Authors Guild and New York Writers Workshop.

Dann is married to journalist, Michael Hill and has one son and two stepsons.