I am looking for something that would make a 20' to 35' tall privacy
screen. Agressive rooting would be a plus as I'm planting along the
top edge of a large hill. Also, medium to wide span would be a plus.
And of course, I want it fast. "Weed" trees and shrubs are fine with
me.

My main concern is height and speed. I'm willing to sacrifice a
little height to gain faster growth. The Washington Hawthorn sounds
nice, but isn't as fast as I want. Hybrid Willows grow too tall.
Olives aren't quite tall enough, but would suffice if they met my
other criteria. The Siberian Elm is a little taller than I'm looking
for (around 45'), but could work since it can be trimmed.

I am basing this on reading catalogs/advertisements. However, I'm
looking for practical experience now. I live in SE Ohio (Zone 6).

Thanks!