— journalist, Polish literature scholar, and political activist.
Born on 5 May 1879 in Kharkiv, where he attended a secondary school. Studied law at Kharkiv University, but before graduating was arrested for socialist activity and deported to St. Petersburg, where he spent fourteen months in prison. After his release he was put under police supervision and prohibited from staying in academic cities. Hence, he was unable to complete his studies in Russia. In 1904, he moved to Paris to study political and social studies. At that time, the Polish Freethinkers Union published his debut brochure entitled Po co człowiek żyje [why man lives]. After his return to Russia, he passed the state exam in law. In 1910, began to cooperate with Russkiye Vedomosti newspaper. Wrote texts devoted to, for instance, Polish literature, which were also published in other periodicals. In 1914, joined the editorial staff of Echo Polskie weekly and then daily, founded in Moscow. Spent the war in Russia, advocating the Polish cause. In 1918, appointed to the Representation of the Polish Regency Council, whose activity was soon prevented by the Bolsheviks, who imprisoned him in July 1919 and held him in custody for six months. After his release, he arrived in Warsaw in January 1920 and then became an editor of Tydzień Polski and then Kurier Poranny. At that time his views had little to do with his youthful fascination with socialist radicalism. He turned to religion and as a publicist he criticized the Bolshevik ideology, devoting a number of articles to describing the Soviet reality. Died on 3 September 1927. Among the admirers of Kozłowski’s journalistic talent and personality was Marian Zdziechowski, who expressed his appreciation in the introduction to a selection of Kozłowski’s writings entitled Półksiężyc i gwiazda czerwona [the crescent and the red star].