He served on Baden's local legislature, the Landtag, from 1895 to 1903 and from 1909 to 1921. He was the chairman of the SPD in Baden from 1908 until 1921.
Geiss also served in a number of executive offices in Baden. When the Republic was first created in 1918, he became Chairman of the Provisional Government, and on 2 April 1919 he became State President and Head of Government. He also served as Minister for Military Affairs until 1920.
as Grand Duke of Baden
| Chairman of the Provisional Government of Baden
10 November 1919 – 1 April 1919
|First elections in the|
Republic of Baden
|New title|| State President of Baden
1 April 1919 – 14 August 1920
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