tough question, because a lot of times the guys that make tricks and styles popular were by no means the first to do them. jon olsson deserves a lot of credit for making dub corks and dub rodeos popular, but on the other hand, mike wilson was doing dub 10s years earlier, and people before him did "risky flips" (dspin 7 to backflipp). wallisch made pretzels super popular but people did those way before he came along. b-dog made presses, 50-50s, and one footers more popular but the gagniers were doing them way earlier. and, no disrespect, but if you think henrick is the first person to get people to stop using poles then you haven't been following this sport for very long lol.
in the last 5 years: wallisch. with bdog as a close second
last 10 years: mik d, jon olsson or tanner.
for the next 5 years: my money is on henrik
overall: its gotta be the first skiers to popularize park skiing, all the canadian airforce crew.
even this list leaves out important people though like charles gagnier, corey vanular, mike wilson, dumont, candide, travis heed and andy parry and too many others to even name.
sorry for the rant but its aways good to look back at where this ridiculous, awesome sport of ours came from. fuck yea skiing.