Jessica McKellar

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Jessica McKellar
Jessica McKellar selfportrait BW.jpeg
Born1987 (age 34–35)
Alma materMassachusetts Institute of Technology
OccupationFounder and CTO of, Inc., author
Spouse(s)Adam Fletcher[1]

Jessica Tess McKellar is an American software developer, engineering manager, and author.


McKellar attended the Massachusetts Institute of Technology[2] and studied computer science[3] and chemistry.[4]

Early life[edit]

McKellar was born in the San Francisco Bay Area in 1987 to parents Jane and Joel McKellar. She has a younger brother named Max and a younger sister named Olivia.[citation needed]


McKellar was an early employee and engineering manager at Ksplice, which was acquired by Oracle in 2011. In 2012, McKellar co-founded Zulip, a chat software company.[5] In 2014, the company was acquired by Dropbox.[6] She has spoken at several conferences about outreach efforts to increase the diversity of open-source communities.[7][8]

From 2012 to 2014, she was a director of the Python Software Foundation.[9] In 2013, McKellar won the O'Reilly Open Source Award for her contributions to Python.[10][11] In 2016, McKellar won the Women in Open Source Community Award, awarded by Red Hat.[12] She is a contributor to Twisted, a networking framework for Python.[13] From 2014 to 2017, she was a Director of Engineering and the chief of staff to the VP of Engineering at Dropbox.[14]

Jessica was a Senior Technical Advisor on the HBO show Silicon Valley.[15]

As of January 2017, McKellar is the Founder and CTO of, Inc., a bookkeeping service, targeted towards startups, technology companies, and nonprofits.[16]


McKellar is the co-author of the book Twisted Network Programming Essentials, 2nd Edition (O'Reilly Media - 2013).[13]


  1. ^ Jessica McKellar. ".@adamfblahblah and I got married! Our universal logic gate rings (NAND = me, NOR = him)". Twitter.
  2. ^ Root, Lynn (October 15, 2013). "When open source invests in diversity, everyone wins".
  3. ^ McKellar, Jessica (June 2010). Monitoring the health of an open source project : a case study (Thesis). M.I.T. Master of Engineering thesis. hdl:1721.1/61174.
  4. ^ Piro, Nicholas; Figueroa, Joshua; McKellar, Jessica; Cummins, Christopher (1 September 2006). "Triple-Bond Reactivity of Diphosphorus Molecules". Science. 313 (5791): 1276–1279. Bibcode:2006Sci...313.1276P. doi:10.1126/science.1129630. PMID 16946068. S2CID 27740669.
  5. ^ "This Is What Impactful Engineering Leadership Looks Like". First Round Review. First Round Capital. Retrieved March 19, 2015.
  6. ^ Perez, Sarah (March 17, 2014). "Dropbox Acquires Zulip, A Stealthy Workplace Chat Solution Still In Private Beta". TechCrunch.
  7. ^ Daley, Noelle (August 11, 2014). "Q&A with Upcoming FutureTalk Speaker Jessica McKellar".
  8. ^ Daley, Noelle (August 28, 2014). "Python, The Next Generation: A FutureTalk with Jessica McKellar [Video]".
  9. ^ "History of PSF Officers & Directors". Retrieved March 19, 2015.
  10. ^ "O'Reilly Open Source Awards (2013)". July 26, 2013.
  11. ^ Curtin, Brian (August 5, 2013). "Congratulations to Jessica McKellar, O'Reilly Open Source Award Recipient". Python Software Foundation News.
  12. ^ "Women in Open Source Awards". Retrieved Feb 3, 2018.
  13. ^ a b McKellar, Jessica; Fettig, Abe. Twisted Network Programming Essentials (2nd ed.). O'Reilly Media.
  14. ^ "Jessica McKellar". Techies Project. Retrieved 7 April 2016.
  15. ^ "Jessica McKellar". IMDb. Retrieved 7 April 2016.
  16. ^ "Pilot raises $15M to bring bookkeeping into the modern era". TechCrunch.