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.
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 (SCSSM), 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.
Since 2007 and by now Kizin is a partner of the Lawyers Association "Bondarchuk, Kizin and Partners".
Membership in the Ukrainian and international professional associations
Since 2002 Kizin is a member of the Zhytomyr Regional Bar Association. In 2006 he became a member of the European Business Association (EBA). In March 2007 he joined the Ukrainian-American Bar Association (UABA).
Public and political activity
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".
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