Previously, she was deputy food editor for Everyday Food magazine, a Martha Stewart Living Omnimedia publication, which launched her foray into television through its companion TV show. Lewis also managed the test kitchen for Everyday Food, where her duties included recipe development and testing various food combinations. She also wrote a monthly column, “How-To With Allie,” where she offered instruction on basic cooking techniques. She was a contributor at sister publication, Blueprint, and made frequent appearances on Ms. Stewart's own show, Martha, and NBC's Today show. Lewis also hosted a daily radio segment called “Everyday Dinners” on Sirius Satellite Radio's, Martha Stewart Living Radio where she offered time saving ideas for weeknight meals.
After graduating from Yale, Lewis earned her Grand Diplôme at Le Cordon Bleu in Paris. She had previously spent the summer before her senior year in college at Tante Marie’s Cooking School in San Francisco, which fostered her passion for food. While in Paris she worked as a stagiaire at Restaurant Arpège, Alain Passard’s Michelin 3-star restaurant.
Prior to joining Martha Stewart Living Omnimedia in 2002, Lewis worked for Bobby Flay's New York restaurants, Mesa Grill and Bolo, where she served as food & beverage director, and ran her own catering business, Aubergine Catering & Event Consulting. Previously she was an event coordinator at Tentation Special Events Catering.
Her great-great grandfather was Adam Gimbel, the founder of the department store chain that bore his name and the operator of other stores, including Saks Fifth Avenue.
Lewis graduated from Phillips Exeter Academy and earned a bachelor of arts degree in economics from Yale University. In October 2007, she married Andrew Todd Clapp, a principal in Catalyst Investors, an investment firm in New York City. They live in Manhattan's Greenwich Village.