cosign, though for me Boy really sealed Waititi in the category of "will check out regardless".
It feels like much of this thread consists of folks tossing out legendary directors. I agree with many of the names tossed out because they are awesome directors with an accomplished body of work. I'm going to focus more on directors who (perhaps) don't fall into that legendary category, or are in the earlier stages of their career, but because of the strength of a particular film make it so I will automatically check out their other work (a status that can be revoked).
Damien Chazelle - Whiplash. Loved LaLa Land, thought First Man was disappointing. He is still someone i will automatically check out.
Chloe Zhau - The Rider. One of my top 5 films of the decade. She is my new Malick, and I will watch anything she does. I enjoyed Nomadland, though not as much as The Rider. I'm beyond curious to see what she does with a Marvel movie.
Jeff Nichols - Mud. Really appreciated the way he wove in the setting as almost a character. It was gratifying to see him do the same thing in earlier films like Take Shelter and Shotgun Stories. Midnight Special was really good, but more scifi. Disappointed in Loving, but more because biopics sucks almost across the board. I'm still on board.
Asgar Farhadi - About Elly. His ability to deftly build a story that felt balanced and could go in any number of directions stood out. Led me to A Separation (top 10 all time movie for me) and The Salesman. Farhadi is probably a top 3 favorite director for me.
Derek Cianfrance - Blue Valentine. His sharp eye for relational dynamics stood out. Place Beyond the Pines was great and I Know This Much is True was poorly timed coming out during the onset of COVID, when watching super depressing material was especially grueling.
David Lowery - Ain't Them Bodies Saints - classic set up with a different feel. It marked him as distinct in my mind and that was validated in his work in the kid movie PEte's Dragon, and then very much so in A Ghost Story. I will definitely see the upcoming Green Knight movie.
* Joe Talbot - The Last Black Man in San Francisco. I put the * because I loved LBMSF enough to follow Talbot and am eager to see his future work, but I'm not 100% sure he is in that category. He's only done the one film.