René Krolmark (born 11 July 1958), better known by his stage name, Hank Shermann, is a Danish musician best known for his work with the heavy metal band Mercyful Fate.

Shermann started playing guitar in 1977, influenced by the likes of Ace Frehley, Michael Schenker, Uli Roth, K.K.

[1] In 1978 he co-founded and performed with the Danish punk band Brats (under the name Hank de Wank), where he first met future bandmates King Diamond and later Michael Denner.

[2] In 1981 he formed Mercyful Fate alongside King Diamond, where they deviated from punk music and started to write heavier songs.

During this time Shermann composed all the music for 1983's Melissa and most of 1984's Don't Break the Oath, widely considered Mercyful Fate's most seminal albums.