As an alliantgroup trusted tax advisor and consultant, Mr. Guillot assists small and medium-sized businesses navigate America’s tax system to secure incentives and credits that stimulate innovation and improve products and services. He also serves them as an expert resource resolving complex compliance and appellate controversies.

Mr. Guillot recently retired from IRS after 36 years with the agency. From 2019 – 2023 he served as Deputy Commissioner of the IRS’ Small Business/Self Employed Division, overseeing all IRS domestic and international Collection Operations and its Operations Support functions. He also led the creation and oversight of IRS’ Fraud Enforcement Office, providing support and coordination for all IRS efforts in detecting and deterring tax fraud – including leading the most expansive and innovative use of data and systems analytics to address virtual currency by the civil functions of the IRS. While designated Commissioner, SBSE (2021 – 2022) he led IRS’ groundbreaking, successful effort using authenticated voice robotics, eliminating phone hold times for over 14 million taxpayers in less than two years.

Darren’s extensive enforcement background at IRS was balanced by his 14 years’ experience in IRS’ Independent Office of Appeals, culminating in his creation, implementation, and top leadership of the Appeals Judicial Approach & Culture Project (2011 -2013) and its resulting policies and procedures in use to this day. He began his IRS career as a revenue officer and holds a bachelor’s degree from the University of Holy Cross, is a fellow of the Loyola University Institute of Politics and was awarded the Certificate in Public Leadership by the Brookings Institution.

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