Lila is taxonomically a hobbit. Lila Fontes

Email: my last name at
Office: bâtiment Sophie Germain, 4058

Laboratoire d'Informatique Algorithmique: Fondements et Applications (LIAFA)
(Équipe Algorithmique et Complexité)
Université Paris Diderot Paris 7, Case 7014
75205 Paris Cedex 13

About me

I am now a postdoc at the Université Paris 7 Diderot.

I completed my Ph. D. in computer science at the University of Toronto, as a member of the theory group, working under the supervision of Stephen Cook and Toni Pitassi. I did my undergraduate work at Harvard in mathematics, focusing on logic.


I am interested in tradeoffs between online privacy and other measures like communication cost, accuracy, and optimality. Can privacy be traded away in return for faster computation time or better answers to computational problems? Do the same protocols protect privacy from eavesdroppers and other participants? Are some applications and functions hopelessly privacy-revealing?

My general theory interests cover a variety of topics, including computability, distributed computing, cryptography, using randomization in algorithms and proof techniques, and proof complexity.


How to Measure Privacy: a survey. Working paper.
Managing Incentives and Privacy in Mechanism Design. Working paper with Paolo Penna.
Relative Discrepancy does not separate Information and Communication Complexity. Lila Fontes, Rahul Jain, Iordanis Kerenidis, Sophie Laplante, Mathieu Lauriere, and Jérémie Roland. ECCC 2015. To appear in ICALP 2015.
The Hardness of Being Private . Anil Ada, Arkadev Chattopadhyay, Stephen Cook, Lila Fontes, Michal Koucký, Toniann Pitassi. ACM Transactions on Computation Theory, volume 6(1), 2014.
Trading Privacy for Communication. Lila Fontes. Ph.D. dissertation, successfully defended February 19, 2014.
The Hardness of Being Private. Anil Ada, Arkadev Chattopadhyay, Stephen Cook, Lila Fontes, Michal Koucký, Toniann Pitassi. CCC 2012 (slides).
Formal Theories for Linear Algebra. Stephen Cook and Lila Fontes. Logical Methods in Computer Science Vo. 8 (1:25)2012,pp. 1--31. An early version appeared in Computer Science Logic (CSL) 2010.
Interpreting LAP into VparityL and V#L. Lila Fontes. Working paper. (draft pdf) This was subsumed by "Formal Theories for Linear Algebra," above.
Formal Theories for Logspace Counting. Lila Fontes. M. Sc. thesis. (pdf, arXiv)


I enjoy teaching. I've been a teaching assistant for:

I planned, marked, and lectured in CSC 2429: Communication Complexity, Information Complexity, and Applications during the fall 2012 term.


Service: I was on the Department of Computer Science Chair's Search Committee (spring 2010). I served as treasurer for the Computer Science Graduate Student Benevolent Society (CSGSBS) from '09-'11. I was a CS representative to the Graduate Student Union '08-'09.

Sports: I have in the past enjoyed gymnastics, crew, skiing, and rugby, and synchronized swimming. This has resulted in some cool images of my knee (see my MRI and X-ray), and some knee surgeries. I do not recommend knee surgery as an enjoyable pastime. I also run and sometimes shoot arrows, although not at the same time (yet).

Communication: I have an online presence, as you well know. I maintain a personal blog, and, with my siblings, an oft-neglected silly blog. I sometimes tweet interesting links, if you're into that kind of thing.

Useful resources

Complexity Zoo
Looking for a LaTeX symbol? Try Detexify or The Comprehensive LaTeX Symbols List .
Bibtex help
MathWorld + Wikipedia = Planet Math

Grace Hopper
Anita Borg Institute

The estimated scale of the universe and everything (warning: autoplays music)
Neighborhood markets in Paris
Help the British Library accurately place historical maps .
A F.A.Q. for your thesis defense.