Katherine Albrecht is one of the most visible and active critics of Radio-frequency Identification, and the author of Spychips. She spoke really eloquently about her position this weekend at the Recalling RFID conference in Amsterdam.
While she is most well-known for her spychips work, Albrecht also has a history of activism against supermarket loyalty cards, so I could not resist asking her to sign my Albert Heijn Bonus Card. The best part is that, by signing it, she also disabled it:
Excellent photograph courtesy of Anne Helmond.