In 2017, a tenured security professor accepted Google’s offer to run Android Platform Security, trading his academic perch in Austria for a shot at shaping protections on over two billion devices. He thanked Dave Kleidermacher and Nick Kralevich for making the switch possible and dove into a culture that once prided itself on “Don’t Be Evil,” carbon neutrality and turning down Pentagon contracts after employees objected. Inside Android Security, he worked alongside Dianne Hackborn and others to roll out full-device encryption in Android 10, end-to-end encrypted backups, Insider Attack Resistance, ARM MTE and privacy-first digital credentials—all features that shifted the mobile ecosystem toward stronger user safety. Over time, top-level management dropped its renewable energy goals in favor of powering massive AI models and quietly inked “any lawful purpose” agreements with the U.S. Department of Defense. Those deals run counter to international human-rights norms and effectively green-light everything from offensive warfare support to mass surveillance of Europeans. As a pacifist and EU citizen, he refuses to be complicit in projects that “proactively harm people” or violate European privacy laws. He learned about these shifts only after they’d been decided, with no internal debate or transparency. Faced with a choice between staying silent or upholding his values, he handed in a three-month notice effective August 31, 2026. During that period, he’ll wrap up or reassign Android Security tasks and immediately detach from any AI-related work tied to the DoD deal. Afterward he’ll continue research in end-to-end encrypted communication, digital identity, supply-chain security and embedded systems—fields where he can still influence open-source projects, including AOSP. He closes by expressing genuine sadness at leaving colleagues he believes still want to “do good for the planet,” while calling on Google’s leaders to reclaim the ethical standards that once guided critical decisions.