Alan L Oppenheimer, CPA, MBA, has worked for both large- and medium-size companies and experienced avariety of management styles and business situations over his forty-plus years o...ver maisAlan L Oppenheimer, CPA, MBA, has worked for both large- and medium-size companies and experienced avariety of management styles and business situations over his forty-plus years of professional tenure. Alan also consulted for several companies in areas such as mergers and acquisitions, bankruptcy, bank loans, forecasting, and year-end audit preparation.ver menos