Inherent technical limitations mean that contact-tracing apps, at best, play a relatively small public health role and, at worst, risk doing more harm than good.
Jim Waldo is a professor of the practice of computer science at Harvard, where he is also a professor of technology policy at the Harvard Kennedy School and Chief Technology Officer for the school of engineering. His main areas of study are technology policy, cybersecurity, and distributed systems. Prior to joining Harvard, he was a software engineer in industry for over 30 years.
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