Glyph Lefkowitz is an American open-source software programmer and creator of the Twisted network programming framework for Python.

[2][3] His work on asynchronous programming techniques influenced the core Python language,[4][5] as well as the JavaScript Promises ecosystem, through Dojo and Mochikit.

He is a frequent speaker at developer conferences and was elected a fellow of the Python Software Foundation (PSF) in 2009.

[6][7] Between 2009 and 2013, he was one of the primary contributors of Apple's Calendar and Contacts Server (CCS) software.

[8][9] In 2017, the PSF awarded Lefkowitz their Community Service Award for his influence on the direction of the Python language and community, including his role in pioneering asynchronous programming models.