A recognized expert on managerial accounting, Professor Maher is also an authority on corporate crime (e.g., fraud, bribery, antitrust). He develops profiles of companies and managers that commit corporate misconduct, and studies and lectures on corporate ethics and the responsibilities of business and auditors to stakeholders.

Professor Maher focuses his research on the efficiency of recent developments in managerial accounting, including activity-based costing, benchmarking and theory constraints. He has authored more than 10 books on the principles and essentials of managerial accounting and written or edited chapters in more than 20 other publications. He has published more than 30 major articles in top academic journals. He teaches courses on managerial accounting and on using performance measurements and rewards to motivate people.

Professor Maher has conducted research on anti-trust issues related to the airline industry, the cost effectiveness of online education and health care costs. He consults for many different industries, including computer software, automobile, defense, health care, government and pharmaceuticals.