Professor of computer science at Johns Hopkins University. Teaches courses in computer security and privacy. Primary research interest is the security of electronic voting, and is the director of the NSF ACCURATE Center. He is also an election judge in Baltimore County. Besides his faculty position, he is also the president and founder of a computer security consulting firm called Independent Security Evaluators. His hobbies are photography, soccer, tennis, sailing, golf, billiards, high tech gadgets, and playing with his kids.