Why Guido van Rossum Unretired to Join Microsoft: The Story Behind Python’s Creator

Returning to Work After Retirement

Python’s creator Guido van Rossum recently announced that he has ended his retirement and joined Microsoft’s developer division. Before retiring in October of last year, he had worked at Dropbox for six and a half years after a six‑year stint at Google.

In interviews before his retirement, van Rossum described feeling overburdened by the constant need to guide the Python community and explain the language’s philosophy, especially after the controversial PEP 572 proposal, which led to negative comments from some core members on social media.

He now says that at Microsoft he will focus on improving Python’s usability not only on Windows but across all platforms.

Microsoft confirmed his arrival, stating that they are excited to have him in the developer team and that his presence reflects their commitment to supporting the Python community.

Guido van Rossum’s Career

Guido van Rossum is a Dutch computer programmer. He earned a master’s degree in mathematics and computer science from the University of Amsterdam in 1982 and subsequently worked at several research institutions, including the Dutch National Research Institute for Mathematics and Computer Science, the U.S. National Institute of Standards and Technology (NIST), and the Corporation for National Research Initiatives (CNRI).

He received the Free Software Foundation’s Advancement of Free Software award in 2001, the Dutch UNIX Users Group award in 2003, and was recognized as an ACM Distinguished Engineer in 2006.

He began developing Python in 1989 while at CWI, continued the work during his time at Google (2005‑2012) where he built the internal code‑review tool Mondrian and contributed to App Engine, and later worked at Dropbox before moving to Microsoft.

The Birth of Python

In the late 1970s and early 1980s, a group at CWI was designing the ABC language. Guido joined the group in 1983, but ABC never achieved wide success.

Inspired by the rise of the Internet and open‑source movement, Guido decided to create a simple scripting language that retained ABC’s strengths while eliminating its weaknesses.

He implemented a simple virtual machine, parser, and runtime library, introduced indentation‑based block structure, and added powerful data structures such as dictionaries, lists, strings, and numeric types.

He named the language “Python” after the Monty Python comedy troupe and created its iconic logo, merging ABC’s advantages into a language that would become one of the most popular programming languages and a favorite among AI researchers.