I've read that wheat whiskey, whilst something of an oddity nowadays, was originally the dominant grain used in the US and that distilling (oft-times illicit) in New York favoured both wheat and rye a long time before corn even came on the scene. Bernheim is a seven year old whiskey made from 'soft winter wheat'. Unlike 'wheater' bottlings (such as Larceny, Pappy Van Winkle Weller etc), Bernheim doesn't use its wheat as a simple flavour addition as one might do so with rye - instead, this bottling is 51% wheat to begin with.
I.W. Harper is one of Bernheim’s slightly less well known bourbon brands. Launched in 1872 by Issac Woolf and Bernhard Bernheim the brand has switched owners several times over the past near 150 years – it’s currently held by Diageo. The current Louisville distillery was opened in 1992, but had previously been located in several different locations. The brand was largely absent from the US through the 90s and 00s (though still highly popular in other countries such as Japan), but returned in 2005 with an I.W. Harper NAS and 15 year old expressions.