in 1899 In 1893, at the age of only 16, he was a founding member of the Brandenburg football club in Berlin. In 1896, he was one of the 12 students who founded the
Mittweidaer BC, the Mittweida school's
football team, and in 1899 he founded, together with other students, the
Chemnitz SC Britannia, from which
Chemnitzer FC later emerged. On 28 January 1900, Steinberg was sent to
Leipzig to attend the founding meeting of the
German Football Association (DFB) as a delegate of both Mittweida and Britannia. It was around this time that Steinberg met the
Portuguese Virgilio Da Costa, an industrial technical engineer who also played for the Mittweida BC, and with whom he established a great friendship, and they went on to be teammates at
FC Barcelona. In addition to da Costa, Mittweida BC was also the football cradle of the likes of
Antonio Alonso from
Vigo,
Juan Arzuaga,
Adolfo Uribe and
Luis Astorquia from
Bilbao. After moving to Barcelona in 1900, he began playing tennis and football with athletes from Germany, England and Switzerland who lived in the Catalan capital, and together, they founded the Barcelona sports club. In April 1902, the first football school of FC Barcelona was created and Steinberg was appointed director of it in order to "instill his extensive knowledge in the players of the third side". This school was the forerunner of
La Masia, and he managed it until 1916, which means that, in a way, he was the first-ever youth coach of FC Barcelona. From 5 December 1902 to 6 November 1907, he was a member of Barça's board. He was also a prominent driver of the
Spanish Football Federation and the
Referees Commission. On multiple occasions, Steinberg would take the role of the referee. In 1906, together with
Joan Gamper, the Parsons brothers (
John and
William), the Witty brothers (
Arthur,
Ernest) and
Arthur Leask, among others, Steinberg was one of the founders of the
Lawn Tennis Club Barcelona (later
Real Club de Tenis Barcelona). In the same year, between 8 February and 9 December, he held the presidency of the Federation of Football Clubs of Barcelona, which later became the Catalan Football Federation. Also in 1906, he wrote as an editor for the sports newspaper
El Mundo Deportivo, being one of the members of its first-ever edition launched on 1 February 1906. In addition to his passion for football, he was also enthusiastic about athletics, cricket, tennis, and
field hockey. An accomplished sportsman, he also excelled as an athlete in the 100m and 400m, seeing success in those categories in sprinting tournaments held in Barcelona at the time. ==Footballing career==