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Melissa O'Neill's Homepage

Photo of Melissa O'Neill (taken at Corning Museum of Glass, Corning, NY)

Contact Info
Melissa O'Neill
Computer Science Department
Harvey Mudd College
Olin Science Center, B157
1250 North Dartmouth Avenue
Claremont, CA 91711-5980
United States of America

Telephone: (909) 607-9661
FAX: (909) 607-8364

I'm Melissa O'Neill, Professor of Computer Science in the CS department at Harvey Mudd College. Here you'll find some of the things I'm up to…

Research & Active Projects

I am particularly interested in topics in the systems area of computer science. Active research includes areas in making parallel and concurrent programming easier, and in memory management.

PCG Family of Random Number Generators

Did you know that the random number generator in your favorite programming language is probably flawed? Check out for details on the PCG family of random number generators which provides a combination of features rarely seen on existing generators.

Learn more at…

Observationally Cooperative Multithreading

It's great if you have an embarrassingly parallel problem, but what about the more awkward cases, like irregular parallelism and intrinsically concurrent work. Traditionally, you'd have to write programs with locks to manage the concurrency, but locks are well known to be error prone. OCM provides an alternative strategy highly suited to modern hardware transactional memory.

Free Software

I'm a big believer in free and open source software.


Here are some papers you might find interesting:

You can find more papers and more information about the ones above on my papers page.


The courses I teach include

  • Data Structures & Program Development (CS 70)
  • Programming Languages (CS 131)
  • Operating Systems (CS 134)

You can find the webpages for these courses via the department's course pages.