Although she was born in Hamburg, Clara Wichmann spent most of her life in the Netherlands.
She was the daughter of Arthur Wichmann, a university professor in mineralogy and geology and of Johanna Theresa Henriette Zeise (1852–1938) as well as the sister of the artist Erich Wichmann (1890−1929).
In 1902 she studied philosophy and Georg Wilhelm Friedrich Hegel's works.
Between 1903 and 1905 she studied law.

As a student, Clara Wichmann was active in the feminist movement and took part in Comité Misdaad en Straf in which Hendrik Ebo Kaspers was also involved.
She was active in the feminist movement since 1908 and became an anarchist in 1918.
In 1917, she met Jonas "Jo" Benjamin Meijer (1895–1969), whom she married in 1921.
Meijer refused to serve in the First World War and was sent to jail.
During this time Wichmann wrote him many letters.
Wichmann and Meijer were close friends with Albert de Jong, a Dutch anarchist, and Bart de Ligt (with whom she and others formed the 'Bond van Revolutionair Socialistische Intellectuelen' in 1919).

She was very active in the anarchist, anti-militarist and feminist movements, primarily through her publications.
She also wrote many articles which were hugely critical of the criminal justice system.
She first wrote on this subject in 1912 in her dissertation called 'Beschouwingen over de historische grondslagen der tegenwoordige omvorming van het strafbegrip' (Leiden, 1912).
In this she advocated abolishing the idea of punitive justice as a guiding principle of criminal law.
In 1919 she created the 'Committee action against the existing conceptions of Crime and Punishment'.
On 21 March 1920 she gave her most famous talk on "Crime, punishment and society'.
In this lecture she put forth the proposition that crime comes from social injustice, and that she believed most 'crime' would disappear with equitable social relations.
Although she was born in Hamburg, Clara Wichmann spent most of her life in the Netherlands. She was the daughter of Arthur Wichmann, a university professor in mineralogy and geology and of Johanna Theresa Henriette Zeise (1852–1938) as well as the sister of the artist Erich Wichmann (1890−1929). In 1902 she studied philosophy and Georg Wilhelm Friedrich Hegel's works. Between 1903 and 1905 she studied law.
As a student, Clara Wichmann was active in the feminist movement and took part in Comité Misdaad en Straf in which Hendrik Ebo Kaspers was also involved. She was active in the feminist movement since 1908 and became an anarchist in 1918. In 1917, she met Jonas "Jo" Benjamin Meijer (1895–1969), whom she married in 1921. Meijer refused to serve in the First World War and was sent to jail. During this time Wichmann wrote him many letters. Wichmann and Meijer were close friends with Albert de Jong, a Dutch anarchist, and Bart de Ligt (with whom she and others formed the 'Bond van Revolutionair Socialistische Intellectuelen' in 1919). 
She was very active in the anarchist, anti-militarist and feminist movements, primarily through her publications. She also wrote many articles which were hugely critical of the criminal justice system. She first wrote on this subject in 1912 in her dissertation called 'Beschouwingen over de historische grondslagen der tegenwoordige omvorming van het strafbegrip' (Leiden, 1912). In this she advocated abolishing the idea of punitive justice as a guiding principle of criminal law. In 1919 she created the 'Committee action against the existing conceptions of Crime and Punishment'. On 21 March 1920 she gave her most famous talk on "Crime, punishment and society'. In this lecture she put forth the proposition that crime comes from social injustice, and that she believed most 'crime' would disappear with equitable social relations.
Clara Wichmann