From 1982 to 1991 Kizin studied in school number 23 in Zhytomyr. Kizin participated in the national revival of the late 1980s and early 1990s in the Zhytomyr region, attended meetings of the Taras Shevchenko Society of Ukrainian Language and took part in such events as "Chain of Unity" and the student's hunger strike in 1990 in Kyiv. In 1992–1998 he studied at the Faculty of Law in the Ivan Franko National University of Lviv, obtained the qualification of jurist. Since March 1994 Kizin worked on different positions in the district court. Since 1996 he worked in the Department of justice. In 1998–2002, Kizin worked at the State Commission on Securities and Stock Market as an assistant to the head of the State Commission on Securities and Stock Market, than as the Deputy Head of the SCSSM Legal Department. Since 2002 he occupied himself with the private law practice. Kizin was admitted to the Bar, receiving the Certificate for the right to advocacy. He also became a member of the Zhytomyr Regional Bar Association. From 2003 to 2007 he was a partner of the Law Firm "Kizin, Chibisov and Partners". Since 2007 and by now Kizin is a partner of the Lawyers Association "Bondarchuk, Kizin and Partners".
Since 2002 Kizin is a member of the Zhytomyr Regional Bar Association. In 2006 he became a member of the European Business Association. In March 2007 he joined the Ukrainian-American Bar Association.
In 2009 Kizin became a co-founder of the Public Organization "Lustration". Since 2009 he is a member of the All-Ukrainian Union "Svoboda", Deputy Head of the Legal Department. During this period on a cost-free basis he has hold dozens of high-profile trials in defense of political prisoners, opposition journalists and civic activists. Among them – Olena Bilozerska, Mykola Kokhanivskiy, Vitaliy Zaporozhets, Andriy Korenivskiy, Olena Halahuza, Roman Orynovskiy and many others. Since February 2010 he is a chairman of the Zhytomyr Regional Organization of the All-Ukrainian Union "Svoboda". In the 2014 parliamentary election Kizin was 21st on the election list of his party; since the party came 0,29% short to overcome the 5% threshold to win seats on the nationwide list he was not elected into parliament.
Family
In 2008 Sydir Kizin married to Marianna Kizina. Together they bring up the son Ustym.
