John Dolan is considered to be one of the world’s top experts in HPLC. He has written more than 300 user-oriented articles on HPLC troubleshooting over the last 30 years, in addition to more than 100 peer-reviewed technical articles on HPLC and related techniques. His three books (co-authored with Lloyd Snyder), Troubleshooting HPLC Systems, Introduction to Modern Liquid Chromatography (3rd edn), and High-Performance Gradient Elution, are standard references on thousands of desks around the world. He has taught HPLC training classes around the world to more than 10,000 students.