After some success as cyclist on vélodrome in Varambé (GE) in 1893/94, motorcyclist (he designed a prototype), mechanic and car driver from 1895 to 1909, he was attracted by the aviation that became very popular in Switzerland in 1908/9.

Despite his relatively low experience, he participated, beginning in April 1910, at several flight meetings in Italy, France and Portugal, and proposed by Armand Dufaux, he overflew Paris on 18 July 1910.

During the flight meeting in Luzern in September 1910, Emil Taddéoli collided with a line of trees just before landing; he left the wreck of his airplane unhurt; another pilot, Hans Schmid, fatally crashed.

For a while he earned his living flying passengers, later Taddéoli left Switzerland for Sesto Calende in Italy on the southern tip of Lago Maggiore where he was hired as test pilot for Savoia in mid-1914.

On 12 July 1919, with a passenger on board, he flew from Calende on Lago Maggiore to Lake Geneva in 110 minutes, overflying the Mont Blanc (4,695 metres (15,404 ft)) massif in his Savoia S-13.

Emile died on 24 May 1920 when a SIAI S.13 in which he was making a demonstration flight at an air show in Romanshorn disintegrated at an altitude of 700 metres (2,300 ft).