I have seen a number of hugelkultur beds, functioning well.
The person who has the most expertise and brilliance in this realm is James (Jim) Kovaleski, up in Maine near Scythe Supply. He builds incredible hugel mounds using only a scythe and a hand-saw. He sees 400+% increases in squash yields when planted in his beds - amazing!
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Jim Kovaleski, Hugelkultur Maestro