In a past issue of Business Valuation Update, former IRS territory manager Michael Gregory (Michael Gregory Consulting LLC) gave his perspective on how the IRS is approaching discounts for lack of marketability (DLOM) appraisals today. Now, Gregory has written a book, Discount for Lack of Marketability and the IRS, which provides the single most authoritative and up-to-date introduction available on the topic of DLOM and the IRS. Gregory championed the DLOM Job Aid published by the IRS in August 2011, and this book helps readers understand DLOM and choose the approach to it that works best for them. It provides comments from leading DLOM modelers on their models, recommendations about sources for current DLOM data, and reviews of relevant federal court cases.