Brett Cannon has been a core developer since 2003, letting him touch much of Python's code base in some way. Thanks to that amount of time and a penchant for writing too much, it has allowed him to become the 5th most prolific PEP (co-)author. He served on the Python steering council for 5 consecutive years, starting with the inaugural council. Probably the biggest things Brett is known for are importlib, trying to make the 2->3 transition easier, pyproject.toml, and his blog at https://snarky.ca . Basically Brett has been around long enough you can thank/blame him for a bunch of stuff.
A big proponent of the Python community, Brett's known for his quote, "I came for the language, but I stayed for the community", which still holds true for him today. He served on the PSF board a number of times and received the Frank Willison Award in 2016.
Brett lives in Vancouver, Canada with his wife and child (who just became a toddler, hence the current lack of hobbies).