Hank Zumbahlen has worked at ADI since 1989, originally as a field applications engineer based in California. For the last several years, he has been involved with training and seminar development as a senior staff applications engineer. Previously, he held a similar position at Signetics (Philips)—and positions as a design engineer at several companies, primarily in the test and measurement areas. Hank has a B.E.E.E. from the University of Illinois. He is the author of the Linear Circuit Design Handbook (Newnes-Elsevier 2008).