Eichler was born inBerlin, the son of a postal worker. He attendedVolksschule and then became a clerk.[2][3] Between 1915 and 1918, he served as a soldier in theFirst World War.[4][5]
In 1922, he went to work as the secretary of thesocialist philosopher,Leonard Nelson,[6] who founded theInternationaler Sozialistischer Kampfbund (ISK). He became a close confidant of Nelson.[2] In 1923, he joined the SPD, but remained a follower of Nelson and became a member of the ISK. After Nelson's death in 1927, Eichler became chairman of the ISK.[6][7]
Eichler's political activities caused him to be expelled from France in 1938.[2] Shortly before the outbreak of war, Eichler found asylum inEngland,[2][5] where he returned to the SPD. In London, Eichler worked at theBBC making broadcasts aimed at German workers and publishedEurope Speaks. In 1941, he was a founding member and board member of theUnion deutscher sozialistischer Organisationen in Großbritannien, which, after the war, merged with the SPD.[5] Toward the end of his exile inLondon, he worked closely with historianSusanne Miller, a German Jewish refugee, who later became his wife.
Eichler returned to Germany in 1946 and got involved rebuilding the SPD. He founded the magazineGeist und Tat, which he edited till his death in 1971.[5] Until 1951, he also worked aseditor-in-chief of the SPD newspaper, theRheinische Zeitung.
Eichler was a member of the SPD executive committee from 1946–1968, chairman of theMiddle Rhine district of the SPD from 1947–1953,a member of theNorth Rhine-WestphalianLandtag from 1947–1948 and a member of theBundestag from 1949 to 1953.[4][5] He also served as a member of theZonenbeirat, the advisory committee to theBritish occupied zone.
In 1948 and 1949, Eichler was a member of theWirtschaftsrat des Vereinigten Wirtschaftsgebietes, an economic advisory council of theBizone. While serving in the Bundestag in the early 1950s, Eichler was the vice chairman of the Committee on the Press, Radio and Film. During the period after the war, Eichler was one of the leading theoreticians in his party and was the chairman of the decision-making commission to prepare for theGodesberg Program.[7]
Between 1934 and 1948, Eichler wrote numerous articles under various pen names, including Martin Hart, H. M., Walter Buchholz, Walter Holz and Ernst Friesius. He had two articles inDas Andere Deutschland and over 360 articles in theSozialistische Warte. Eichler wroteDas Parlament als Repräsentant der Öffentlichkeit im Rundfunk, which appeared inDie Freiheit des Rundfunks, published in Munich in 1956.
^"Dringender Appell für die Einheit" (PDF)Der Funke, No. 147 A, Berlin (June 25, 1932). Page 2. Friedrich Ebert Foundation, official website. Retrieved July 6, 2010(in German)
Dorls(from 13 December 1950 WAV-Gast, from 17 January 1951 WAV, from 26 September 1951 Non-attached, am 23 October 1952 Mandatsaberkennung)
Frommhold(from 7 September 1949 Nationale Rechte, from 5 October 1950 Non-attached (DRP), from 26 March 1952 DP-Gast, from 11 February 1953 Non-attached)
Miessner(from 5 October 1950 FDP-Gast, from 20 December 1950 FDP)
Rößler(from 15 September 1949 Nationale Rechte, from 6 September 1950 Non-attached, from 13 December 1950 WAV-Gast, from 17 January 1951 WAV, from 26 September 1951 Non-attached, until 21 February 1952)
Thadden(from 15 September 1949 Nationale Rechte; 1950 DRP, from 20 April 1950 Non-attached)
Ott(Non-attached, from 4 May 1950 WAV-Gast, from 13 October 1950 BHE/DG, from 21 March 1952 Non-attached, from 26 March 1952 DP/DPB-Gast, from 26 June 1952 Non-attached)