Guillermo Dietrich was born in Buenos Aires, Argentina of German descent.

[4][1] In 2009, he was named head of Transport and Transit by Mayor Mauricio Macri, where he developed the Metrobús system of lanes for collectives suspected and investigated for surcharges.

[5][6] At the end of November 2015, Mauricio Macri, as President-elect of Argentina, appointed him to head the Ministry of Transport.

[7] He promoted the "Revolution of the airplanes": the takeoff of the low cost market, the modernization of airports and connections were added.

During its management the underground of the Sarmiento Railroad was reactivated, with the participation of Odebrecht and IECSA.