This series shines a spotlight on open source developers who make a real difference. Too often, their contributions go unrecognised. By highlighting their achievements, this series aims to give these talented developers the recognition they deserve and to celebrate the dedication, creativity, and passion that drive the open source community forward.
We kick off the series by spotlighting Todd Miller and his contributions to open source.
Many of the most important components in the open source ecosystem are not flashy applications but small utilities that quietly underpin the daily operation of Unix and Linux systems. One such tool is sudo, and for more than three decades Todd Miller has been the sole maintainer of the project providing almost all the code commits.
sudo is such an important tool. This command-line utility allows a permitted user to execute commands as another user, typically the superuser. Instead of logging in as root or sharing the root password, administrators can delegate specific privileges to users while maintaining detailed logs of administrative activity. The basic philosophy is to give as few privileges as possible but still allow people to get their work done. This approach improves both security and accountability on multi-user systems.
Although sudo was originally created in the early 1980s by Bob Coggeshall and Cliff Spencer, Todd C. Miller became its principal maintainer in the 1990s and has continued to lead the project ever since. His stewardship has ensured that the software remains reliable, secure, and compatible across a wide range of Unix-like operating systems.
Over the years Miller has overseen major enhancements to sudo, including improvements to authentication methods, more flexible configuration through the *sudoers* policy system, a suite of unit tests, support for I/O logging to the sudo privileged access management suite as well as the introduction of a plugin architecture that allows external modules to extend the program’s capabilities. These developments have allowed sudo to evolve into a sophisticated privilege management framework rather than a simple command wrapper.
Security has always been a central focus of Miller’s work. Because sudo operates at a critical point in the operating system’s security model, it must be carefully audited and maintained. Miller has spent decades reviewing patches, fixing vulnerabilities, and coordinating with operating system vendors and security researchers to ensure the tool remains trustworthy.
Today sudo is included by default on virtually every Linux distribution and many BSD and Unix systems. System administrators rely on it daily to manage servers, developer machines, and cloud infrastructure. The program’s flexibility allows organisations to define detailed policies governing who can run which commands and under what circumstances. sudo is free software, distributed under an ISC-style license.
Todd C. Miller’s contribution to open source illustrates the importance of long-term project stewardship. Maintaining widely used infrastructure software requires careful attention to stability, security, and compatibility. Through decades of sustained work, he has ensured that sudo remains one of the most dependable and widely used utilities in the Unix and Linux ecosystem.
Todd has also contributed to OpenBSD, ISC cron, and other projects.