Spoilers for all of DS9 and TNG.

A Klingon from Star Trek: The Next Generation and Star Trek: Deep Space Nine, played by Michael Dorn.
2340 (Stardate 17938): Born into The House of Mogh on Dec. 9.
2346 (Stardate ~23000): His parents die in the Kitomer attack. Worf (age 6) is rescued by Sergey Rozhenko and is adopted by him and his wife Helena Rozhenko.
2357 (Stardate ~34000): Worf is the first Klingon to enter the Starfleet Academy.
2361 (Stardate ~38000): Left the academy.
2364 (Stardate ~41000): Assigned to the NCC-1701-D as relief con and tactical officer. (Rank: Lieutenant j.g)
2365 (Between Stardates 41986 and 42073.1): Promoted to lieutenant and made permanent security chief aboard the NCC-1701-D following the death of Natasha Yar (Skin of Evil).
2367 (Stardate 44995): Resigned from Starfleet to fight in the Klingon Civil War (Redemption, Part 1).
2368 (Stardate 45020): Starfleet commission reactivated, no change in rank. (Redemption, Part 2)
2371 (Stardate ~48000): Promoted to lieutenant commander and put on detached leave from Enterprise (Star Trek VII: Generations)
2372 (Stardate 49011.4): Transferred to command division on Deep Space Nine under Captain Benjamin Sisko and is excommunicated by Gowron for refusing to support the Klingon attack on Cardassia (The Way of the Warrior).
2373 (Between Stardates 50712.5 and 50814.2): Joins The House of Martok, bringing honor back to himself (Soldiers of the Empire).
2374 (Stardate 51247.5): Married to Jadzia Dax on April 1 (You are Cordially Invited).
2375 (Shortly after Stardate 52645.7): Becomes the Federation ambassador to Qo'Nos (What You Leave Behind).

Other stuff:

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