George Zimmer was the founder of The Men's Wearhouse clothing chain and CEO, board chair, and television spokesperson for the company for forty-one years. Under Zimmer, The Men's Wearhouse became the largest men's specialty chain in history. America knew George Zimmer for one of the most famous slogans in television advertising history: “I guarantee it.” Zimmer rode his promise to lead the Men's Wearhouse to unimagined success as a retail giant. For forty-one years, George Zimmer forged a relationship with American men who wanted to like the way they looked without getting too fussy about it. I GUARANTEE IT recounts the journey of Zimmer's rise, the fall of the Men's Wearhouse, and his personal renewal.