Table:
text: 1950 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Driver Rounds
Alfa Romeo SpA Alfa Romeo 158/50 Juan Manuel Fangio 1–2, 4–7
Alfa Romeo SpA Alfa Romeo 158/50 Giuseppe Farina 1–2, 4–7
Alfa Romeo SpA Alfa Romeo 158/50 Luigi Fagioli 1–2, 4–7
Alfa Romeo SpA Alfa Romeo 158/50 Reg Parnell 1
Alfa Romeo SpA Alfa Romeo 158/50 Consalvo Sanesi 7
Alfa Romeo SpA Alfa Romeo 158/50 Piero Taruffi 7
Scuderia Ambrosiana Maserati 4CLT/48 David Murray 1, 7
Scuderia Ambrosiana Maserati 4CLT/48 David Hampshire 1, 6
Scuderia Ambrosiana Maserati 4CLT/48 Reg Parnell 6
T.A.S.O. Mathieson ERA E Leslie Johnson 1
Peter Walker ERA E Peter Walker 1

text: 1950 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Driver Rounds
Philippe Étancelin Talbot-Lago T26C Eugène Chaboud 6
Ecurie Rosier Talbot-Lago T26C Louis Rosier 2, 7
Ecurie Rosier Talbot-Lago T26C Henri Louveau 7
Cuth Harrison ERA B Cuth Harrison 1-2, 7
Peter Whitehead Ferrari 125 Peter Whitehead 2, 6–7
Scuderia Ferrari Ferrari 125 275 375 Luigi Villoresi 2, 4–5
Scuderia Ferrari Ferrari 125 275 375 Alberto Ascari 2, 4–5, 7
Scuderia Ferrari Ferrari 125 275 375 Raymond Sommer 2, 4
Scuderia Ferrari Ferrari 125 275 375 Dorino Serafini 7
Scuderia Ferrari Ferrari 125 Peter Whitehead 4
Scuderia Milano Maserati 4CLT/50 Felice Bonetto 4
Scuderia Milano Milano-Speluzzi 1 Felice Bonetto 7

text: 1950 Formula One season
Teams and drivers
Teams and drivers
Entrant Constructor_ Chassis Driver Rounds
Peter Walker ERA E Tony Rolt 1
Joe Fry Maserati 4CL Joe Fry 1
Joe Fry Maserati 4CL Brian Shawe-Taylor 1
Bob Gerard ERA B A Bob Gerard 1–2
Automobiles Talbot-Darracq Talbot-Lago T26C Yves Giraud-Cabantous 1, 4–6
Automobiles Talbot-Darracq Talbot-Lago T26C Louis Rosier 1, 4–6
Automobiles Talbot-Darracq Talbot-Lago T26C Philippe Étancelin 1, 5
Automobiles Talbot-Darracq Talbot-Lago T26C Eugène Martin 1, 4
Automobiles Talbot-Darracq Talbot-Lago T26C Pierre Levegh 5–6
Automobiles Talbot-Darracq Talbot-Lago T26C Raymond Sommer 6
Ecurie Belge Talbot-Lago T26C Johnny Claes 1–2, 4–7
Officine Alfieri Maserati Maserati 4CLT/48 Louis Chiron 1–2, 4, 6–7
Officine Alfieri Maserati Maserati 4CLT/48 Franco Rol 2, 6–7

Question: Who is the driver whose constructor was Era and whose participant was TASO Mathieson for the teams and drivers of the 1950 Formula 1 season?