Original sentence: Hal Ronald Varian is an economist specialising in microeconomics and information technology.He is currently on leave from the University of California, Berkeley School of Information, and is Chief Economist at Google.His has written two bestselling textbooks Intermediate Microeconomics, an undergraduate microeconomics text, and  Microeconomic Analysis, an advanced text
Edited sentence: " introduces a series of efforts in applying general economic principles to the information economy.As a professor and former dean at the University of California, Berkeley School of Information, the author of many books and papers, a New York Times columnist, and  the Chief Economist at Google, Inc, he is mostly famous for his undergraduate microeconomics text Intermediate Microeconomics and graduate microeconomics text Microeconomic Analysis.As of June 2007, he joined Google as a full time employee.Both of these books are taught in the economics curricula of major universities around the world.Economic laws do not.Hal Ronald Varian is a central academic in the economics of information technology and the information economy.He is an intellectual leader in the economics of security research domain.Varian's assertion that "Technology changes