Éric Greff (born 19 July 1975 in Forbach, Moselle), better known by his aliases Helmut Fritz and Géronimo, is a French singer-songwriter and record producer. Greff is known for his 2009 single "Ça m'énerve", in which he portrays a German dandy living in Paris. The single, produced by Laurent Konrad, was released in March 2009 and rapidly reached number one in France.
To reinforce his identification with the song "Ça m'énerve", Éric Greff wrote a fictional biography for Helmut Fritz.
Helmut Günter von Fritz was born in Reinbek, Germany, the only child of Rudy von Fritz and Annegret Spiegeln, who ran a small factory manufacturing knitted sweaters which earned them a modest but happy living.
In 1998, Helmut's great grand-uncle, Baron Titten von Fritz, died gored and trampled by wild boar while game hunting. Helmut became the only heir to a 300-million Deutsche mark fortune. Rich but stingy, he bought a second-hand Vespa, gave his parents some money, and left Germany.