Sarah is the New York Times Bestselling author of the WHATEVER AFTER, BEST WISHES, MAGIC IN MANHATTAN series, the UPSIDE-DOWN MAGIC series (along with Emily Jenkins and Lauren Myracle), as well as DON'T EVEN THINK ABOUT IT, THINK TWICE, MILKRUN, FISHBOWL, AS SEEN ON TV, MONKEY BUSINESS, GIMME A CALL, TEN THINGS WE DID (AND PROBABLY SHOULDN'T HAVE), HOW TO BE BAD (along with E. Lockhart and Lauren Myracle), and I SEE LONDON, I SEE FRANCE. Sarah's short stories and novellas include A LITTLE BIT BROKEN, A NICE FLING IS HARD TO FIND, KNOW IT ALL, and CRUISIN'.
Sarah's books have been translated into twenty-nine languages and optioned to Hollywood. She was born in Montreal but now lives and writes in New York City.