[1][2] His first company—a pizzeria—was called O sole mio and it was founded in 1976 in the center of Vaasa.
From there he expanded to a pizza franchise chain first called Pizzeria N:o 1.
He was known as the "Pizza-emperor" (Pizzakeisari in Finnish), because he was the founder of a well known pizza franchise chain called Kotipizza which was the new name of Pizzeria N:o 1 which expanded fast outside of Vaasa.
Golden Rax Pizzabuffet however is nowadays a part of Finland's largest hotel & restaurant company Restel Oy Ltd, where Rabbe Grönblom sat on the board.
He was also on the board of the Finnish tyre company Nokian Renkaat (since 2003).