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Michael Hartl

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Michael Hartl
Born
United States
NationalityAmerican
Occupation(s)Physicist, entrepreneur, writer
Academic background
EducationCalifornia Institute of Technology
ThesisDynamics of Spinning Compact Binaries in General Relativity (2003)
Academic work
Main interestsBlack hole dynamics
Tau
Computational physics
Programming languages
Notable worksThe Tau Manifesto
Websitewww.michaelhartl.com

Michael Hartl is an American physicist, author, and entrepreneur.[1][2] He is best known as the creator of the Ruby on Rails Tutorial,[3][4][5] founder of Tau Day,[1][6][7][8] and author of The Tau Manifesto.[1][9][10] In The Tau Manifesto, Hartl proposes replacing pi (π) with tau (2π).[7][11]

Education

In the 1990s, Hartl attended Harvard University for his undergraduate studies, graduating with a bachelor's degree in physics.[12] Hartl obtained his doctorate from the California Institute of Technology in 2003, where he researched black hole dynamics. His dissertation was titled Dynamics of Spinning Compact Binaries in General Relativity.[13]

Career

After finishing his Ph.D., Hartl served as Caltech's editor on a corrected and expanded version of The Feynman Lectures on Physics at the request of Kip Thorne.[14][15] Explaining in the preface why he chose Hartl for the task, Thorne noted that "Hartl understand physics deeply, he is among the most meticulous physicists I have known, and like Feynman he is an outstanding pedagogue."[14][15] Thorne also noted that Hartl is the only Caltech graduate student to be granted a "lifetime achievement award for excellence in teaching" by Caltech's undergraduates.[14][15][16]

In 2010, Hartl published The Tau Manifesto, in which he proposed using the Greek letter tau to represent the circle constant τ = C/r = 2π,[17] the first time tau was publicly proposed for this purpose.[1][6] The Tau Manifesto proved popular,[18] and a revised edition was published in 2019.[19] With the initial publication of The Tau Manifesto in 2010, Hartl also founded Tau Day as a mathematical celebration and to promote adoption of the new constant.[8] Observed annually on June 28, or 6/28 (in analogy with the celebration of Pi Day on 3/14),[6][8] Tau Day has become a widely celebrated mathematical holiday.[1][6][20][21] Hartl's constant has also seen significant adoption, including support for tau in the official Google calculator[22] and inclusion in programming languages such as Microsoft.NET,[23] Java,[24] and Python.[25][26]

Selected publications

Scientific articles

  • Hartl, Michael D. (2003). "Lyapunov exponents in constrained and unconstrained ordinary differential equations". Phys. Rev. E. arXiv:physics/0303077. Bibcode:2003physics...3077H.
  • Hartl, Michael D. (2003). "Dynamics of spinning test particles in Kerr spacetime". Physical Review D. 67 (2): 024005. arXiv:gr-qc/0210042. Bibcode:2003PhRvD..67b4005H. doi:10.1103/PhysRevD.67.024005. ISSN 0556-2821.
  • Hartl, Michael D. (2003). "Survey of spinning test particle orbits in Kerr spacetime". Physical Review D. 67 (10): 104023. arXiv:gr-qc/0302103. Bibcode:2003PhRvD..67j4023H. doi:10.1103/PhysRevD.67.104023. ISSN 0556-2821.
  • Hartl, Michael; Buonanno, Alessandra (2005). "Dynamics of precessing binary black holes using the post-Newtonian approximation". Physical Review D. 71 (2): 024027. arXiv:gr-qc/0407091. Bibcode:2005PhRvD..71b4027H. doi:10.1103/PhysRevD.71.024027. ISSN 1550-7998.

Books

  • Hartl, Michael (2022). Ruby on Rails Tutorial. Boston Columbus New York San Francisco Amsterdam Cape Town Dubai London Madrid Milan Munich Paris Montreal Toronto Delhi Mexico City Sao Paulo Sydney Hong Kong Seoul Sinapore Taipei Tokyo: Addison-Wesley Professional Ruby Series. ISBN 978-0-13-804984-3.
  • Hartl, Michael (2022). Learn Enough Developer Tools to Be Dangerous. Addison-Wesley Professional. ISBN 978-0-13-784345-9.
  • Hartl, Michael (2022). Learn Enough JavaScript to Be Dangerous. Addison-Wesley Professional. ISBN 978-0-13-784374-9.
  • Hartl, Michael (2023). Learn Enough Python to Be Dangerous. Boston: Addison-Wesley Professional. ISBN 978-0-13-805095-5.

References

  1. ^ a b c d e McMillan, Robert (August 13, 2012). "For Math Fans, Nothing Can Spoil Pi Day—Except Maybe Tau Day". The Wall Street Journal. Archived from the original on March 14, 2020. Retrieved July 11, 2024.
  2. ^ "Michael Hartl". InformIT. Retrieved July 11, 2024.
  3. ^ Cooper, Peter (July 30, 2020). "A Q&A with Michael Hartl". Superhighway Ruby Interview Series. Retrieved July 11, 2024.
  4. ^ Olsen, Russ (August 13, 2012). "An Interview with Michael Hartl: Ruby on Rails, the "Magic" Problem, and the Higgs Boson". InformIT. Retrieved July 11, 2024.
  5. ^ Bazinet, Robert (April 12, 2011). "Learning Ruby on Rails with Michael Hartl". InfoQ. Retrieved July 11, 2024.
  6. ^ a b c d Landau, Elizabeth (June 28, 2011). "In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet". CNN. Retrieved July 11, 2024.
  7. ^ a b Bartholomew, Randyn Charles (June 25, 2014). "Why Tau Trumps Pi". Scientific American. Retrieved June 8, 2024.
  8. ^ a b c Hartl, Michael (August 13, 2012). "Tau Day". tauday.com. Retrieved July 11, 2024.
  9. ^ Hartl, Michael (June 28, 2010). "The Tau Manifesto". tauday.com. Retrieved July 11, 2024.
  10. ^ Hartl, Michael (June 28, 2010). "The Tau Manifesto". Amazon.com. Retrieved July 11, 2024.
  11. ^ Aron, Jacob (2011). "Michael Hartl: It's time to kill off pi". New Scientist. 209 (2794): 23. Bibcode:2011NewSc.209...23A. doi:10.1016/S0262-4079(11)60036-5.
  12. ^ "Michael Hartl". LinkedIn. Retrieved July 11, 2024.
  13. ^ Hartl, Michael (2003). Dynamics of Spinning Compact Binaries in General Relativity (PhD thesis). Pasadena, California: California Institute of Technology. Retrieved June 8, 2024.
  14. ^ a b c Feynman, Richard; Leighton, Robert B.; Sands, Matthew. The Feynman Lectures on Physics including Feynman's Tips on Physics: The Definitive and Extended Edition. p. x. ISBN 978-0805390452.
  15. ^ a b c Thorne, Kip. "Preface to the Definitive Edition" (PDF). Retrieved July 13, 2024.
  16. ^ "ASCIT Teaching Awards Recipients 1999-2000". Retrieved July 13, 2024.
  17. ^ Hartl, Michael (March 14, 2010). "The Tau Manifesto" (PDF). Archived (PDF) from the original on July 18, 2019. Retrieved August 5, 2019.
  18. ^ Landau, Elizabeth (June 27, 2017). "The Tao of Tau". Scientific American. Retrieved July 11, 2024.
  19. ^ Hartl, Michael (March 14, 2019) [2010-03-14]. "The Tau Manifesto". Archived from the original on June 28, 2019. Retrieved September 14, 2013.
  20. ^ @MIT (June 28, 2019). "Three cheers for double Pi! #TauDay http://mitsha.re/i9TP50uP4Id
    Image: Chelsea Turner/MIT"     (Tweet). Retrieved July 11, 2024 – via Twitter.
  21. ^ "Tau Day 2024". Simons Laufer Mathematical Sciences Institute. June 20, 2024. Retrieved July 11, 2024.
  22. ^ "tau*1". google.com. Retrieved July 11, 2024.
  23. ^ "Add Math.Tau, MathF.Tau #37517". github.com. Retrieved July 11, 2024.
  24. ^ "TAU". Math (Java SE 20 & JDK 20). oracle.com. Retrieved July 11, 2024.
  25. ^ "Add math.tau". python.org. Retrieved July 11, 2024.
  26. ^ "math.tau". Python 3.12.4 documentation. python.org. Retrieved July 11, 2024.
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