but why not "Geniusz Angielski"? An adjective goes after a noun, as I remember
Geniusz Angielski has specific connotations which I doubt you had in mind
and adjective can be placed before or after the noun but both have specific uses - in the plain use you place the adjective before the noun
biały orzeł is something different to Orzeł Biały
albo "Genialna Angielka"
he is clearly not an Angielka :P;)