Ira Spiro is one of the founding partners of the former law firm, Spiro Moore LLP, known earlier as Spiro Moss LLP. He was with that firm for 12 years. The firm and its attorneys were actively involved in hundreds of class actions on behalf of employees and consumers, including cases against the following companies, and Mr. Spiro had a leading role in many of them:

Travelers Insurance, AIG Insurance, Starbucks Corporation, Wells Fargo Bank, Perrier Group of America, Inc., (Calistoga and Arrowhead bottled water), McKesson HBOC, Inc. (Alhambra and Sparkletts bottled water), Gemeral Motors, Toyota, Bimbo Bakeries (the world's largest bakery company), Interstate Brands Corporation (Wonder Bread, Hostess), Ross Stores, Del Taco, Home Depot, Macy's, Ikea, Best Buy, Pier 1 Imports, Chevron, Toys 'R' Us, Coors Distributing, The Walt Disney Company (Buena Vista subsidiary), The Kroger Company (Ralphs Grocery Company), Advantage Rent-A-Car, Discount Tires, Kaiser Permanente