That would be ecraven (who hangs out in #scheme on Freenode).  See also: <a href="https:&#x2F;&#x2F;github.com&#x2F;ecraven&#x2F;r7rs-benchmarks" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ecraven&#x2F;r7rs-benchmarks</a>