Apple CEO Tim Cook used Twitter to celebrate Steve Jobs' birthday, using one of the founder's own quotes.

The Tweet by Cook was simple, and was only the latest in a series of commemorations of Jobs' life in the last year by the CEO and by Apple itself.

Apple started a year-long series of Jobs remembrances on Feb. 22, 2017 by naming the theater on the Apple Park headquarters facility the "Steve Jobs Theater." Cook name-dropped Jobs throughout the year on assorted interviews.

When the Steve Jobs Theater opened for the iPhone 8 and iPhone X event, Cook led the presentation with a short video celebrating Jobs.

Steve Jobs died on Oct. 5, 2011 at 56 years of age.