John Dieffenbach is the Executive Director and Americas Commercial Excellence Leader at EY, where they oversee the design and execution of commercial operations for the firm's largest and most complex client engagements. With over 30 years of experience in strategic sales across various sectors, John has held leadership positions at firms such as IBM, Accenture, and McHugh Software International. Their career has been marked by a focus on transforming commercial operating models and generating significant revenue. John is committed to empowering teams to unlock their potential and deliver innovative solutions to client challenges.
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