Email:  
For Harvard (non DUS) related mails, please use For DUS related mails use csdus@seas.harvard.edu.  
Please use or for reference letter or manuscript review requests respectively. 
Quick Links: 
Intro TCS  SOS notes  Complexity book  CS 121  seminar 
About me: I am a professor of Computer Science at Harvard University, and a member of the Harvard SEAS Theory of Computing group. Previously, I was a principal researcher at Microsoft Research New England, and before that I was an associate professor (with tenure) at Princeton University’s Computer Science department. I hold a Ph.D from the Weizmann Institute of Science, and was a postdoctoral fellow at the Institute for Advanced Study in Princeton.
DUS: I am co director of undergraduate studies (DUS) of Computer Science at Harvard together with Prof. Stephen Chong. Please email csdus@seas.harvard.edu for any DUS related matters. For information about the Computer Science concentration at Harvard see the page harvardcs.info. See also my contact information and office hours.
Current activities: Local coorganizer for the Women In Theory Workshop on June 2018 at Harvard. Trustee of the Computational Complexity Foundation. Member of the editorial board of the Theory of Computing Journal (ToC) and the Electronic Colloquium of Computational Complexity. Member of the Committee for the Advancement of Theoretical Computer Science (CATCS). I am a co organizer of the Harvard/MSR/MIT reading group. Co organizer of Addis Coder. See my CV for past activities.
Current students: Zhixian Lei, Yueqi Sheng, ChiNing Chou
Current postdoc: Tselil Schramm (co hosted with Jon Kelner, Ankur Moitra and Pablo Parrilo of MIT)
Former students: Sharon Goldberg (co advised with Jennifer Rexford), David Xiao (co advised with Avi Wigderson), Mohammad Mahmoody, Moritz Hardt.
Former postdocs: Benny Applebaum, Thomas Holenstein, Guy Rothblum.
Former interns: Moritz Hardt, Jonah Sherman, Yuan Zhou, LiYang Tan , Aaron Sidford, Aaron Potechin, Pravesh Kothari, Sam Hopkins.
Funding: I am currently supported by NSF awards CCF 1565264 and CNS 1618026 and a Simons Investigator Fellowship. I am grateful for past support by the NSF, as well as the Packard and Sloan foundations and the BSF.
See also my curriculum vitae and brief bio.
AddisCoder 2019 will be on JulyAugust 2019 in Addis Ababa, Ethiopia. We are currently accepting applications for both teaching assistants and students.
I am working on a new book on “Introduction to Theoretical Computer Science”. Comments are welcome as issues/pull requests on the GitHub repository
I wrote a graduate textbook with Sanjeev Arora: Computational Complexity: A Modern Approach. I am currently writing an undergraduate textbook: Introduction to Theoretical Computer Science. I also wrote extensive notes on the sum of squares algorithm (with David Steurer). I occasionally blog on the Windows on Theory blog.
Some surveys and essays I wrote are below. See here for more of my nontechnical writing.
The Complexity of PublicKey Cryptography  survey/tutorial on the computational assumptions landscape of cryptogrpahy. Written in honor of Oded Goldreich’s 60th birthday.
Bayesianism, frequentism, and the planted clique, or do algorithms believe in unicorns?, April 2016. See also blog post on windows of theory blog and video of a talk at Northwestern.
Hopes, Fears, and Software Obfuscation, Communications of the ACM, March 2016. See also preprint version and video of short interview.
Speaking about unspeakables, Harvard Lectures that Last 2016, February 2016, see also video of lecture.
Advice for the budding theorist, blog post on the Windows on Theory blog, November 2015
Sumofsquares proofs and the quest toward optimal algorithms with David Steurer. Survey, also appeard in proceedings of ICM 2014. See also my seminar on this topic, as well as a video of a related talk at Harvard.
Structure vs Combinatorics in Computational Complexity, Windows on Theory blog, October 2013. See also adapted version in the bulletin of the European Association for Theoretical Computer Science.
Truth vs. Proof  the Unique Games Conjecture and Feige’s Hypothesis, Windows on Theory blog, July 2012. See also adapted version in logic in computer science column of the bulletin of the European Association for Theoretical Computer Science.
Here are some of the courses / lectures I (Co) taught (see here for all courses):
Harvard CS121: Introduction to Theoretical Computer Science  Fall 2019, Fall 2018.
Harvard CS229r: Physics and Computation Seminar, Fall 2018.
Harvard CS127: Cryptography, Spring 2018.
Harvard CS229r / MIT 6.S898: Proofs, beliefs and algorithms through the lens of Sum of Squares  Fall 2016  graduate course/seminar on the Sum of Squares algorithm.
Addis Coder 2016 summer course on algorithms and coding for high school students in Ethiopia, August 2016, co taught with Timnit Gebru, Jelani Nelson and a wonderful team of TA’s.
Princeton COS 522  (graduate) Computational Complexity  Spring 2009
Princeton COS 598D  Mathematical Methods in Theoretical Computer Science  Spring 2008
Email: . For Harvard related mails (apart from DUS), please use Any emails related to my role as DUS should be sent to csdus@seas.harvard.edu.  
Please use or for reference letter or manuscript review requests respectively. (emails to these addresses are forwarded to my main inbox, but are also tagged appropriately so I don't lose track of them. Emails to the reference address are also forwarded to my faculty coordinator Allison Choat.)  
Upcoming office hours (in Maxwell Dworkin 329): (see all hours and schedule appointments)


Physical Location: Office 329 (third floor) in MaxwellDworkin Hall, 33 Oxford Street, Cambrdige.  
Mailing Address: Professor Boaz Barak, MaxwellDworkin Hall Room 329, 33 Oxford Street, Cambridge, MA 02138.  
Administrative assistant: Allison Choat, MaxwellDworkin, Room 353, achoat@g.harvard.edu  
Phone: 6174966257 (I prefer email) 