Sam Kumar

Assistant Professor
Computer Science Department
University of California, Los Angeles
Office: 496B Engineering VI
E-mail: samkumar [at] cs [dot] ucla [dot] edu
GitHub: @samkumar

I am an Assistant Professor in the Computer Science Department at UCLA. I am a systems builder interested broadly in system security and networked systems. My work has been recognized with several awards, including a Jay Lepreau Best Paper Award, an IRTF Applied Networking Research Prize, and an ACM SIGSAC Doctoral Dissertation Award Runner-Up. My PhD research on TCPlp significantly influenced the Thread network standard, developed by a consortium of companies in the IoT space (including Google/Nest, Apple, Qualcomm, etc.), and has been adopted in OpenThread, an open-source netowrk stack used in some of these companies' products. My CV is available here (last updated in August 2026).

Prior to joining UCLA, I spent a year as a postdoctoral scholar in the FOCI Center at the University of Washington, supervised by Arvind Krishnamurthy and Ratul Mahajan. Before that, I received my Ph.D. in Computer Science in the EECS Department at UC Berkeley. I was fortunate to be co-advised by David E. Culler and Raluca Ada Popa. During my Ph.D., I worked in the Sky Computing Lab, the RISE Lab (the predecessor to the Sky Computing Lab), and the Buildings, Energy, and Transportation Systems (BETS) research group. Prior to that, I received my B.S. in Electrical Engineering and Computer Sciences at UC Berkeley. As an undergraduate student, I worked in the Software-Defined Buildings (SDB) research group, which was the predecessor to BETS.

In Fall 2026, I will be teaching CS 239 (course website coming soon).

Research Interests

I am interested broadly in system security and networked systems. I am especially interested in building systems that achieve security or efficiency properties, or that navigate the tension between security and efficiency. Lately, I have been investigating the following research directions:

These descriptions are high-level—if you are at UCLA or interested in collaborating, then feel free to ask me about the details.

Students

PhD students:

Masters students:

In my research group, I am working with several undergraduate students: Avi Verma, David Sun, and Woyu Wang. I also work with Nakul Khambhati (B.S. 2025, now a PhD student at UCLA advised by Rafail Ostrovsky), Joonwon Lee (B.S. 2025), and Gary Song (B.S. 2025, now a PhD student at Georgia Tech).