Greenstein has been an Area Director for a national catering company and has managed hotels, country clubs and restaurants. He has been a television chef, columnist and is a consultant to several national kitchen appliance and consumer product manufactures. Lou recently retired after twenty-one years of serving as Director of Auxiliary Services at Southern New Hampshire University.  He has even sailed around the world on a 100-foot schooner as a cook steward.

He conducts a national lecture program on subjects related to the food service industry and culinary history. Lou operates Epicurean Consulting from his offices in North Reading, Massachusetts.