Since 1985, he has successively worked at the Criminal Law Department as an assistant lecturer, senior lecturer, and associate professor (docent).[citation needed]
In 1992, Kropachev headed the special faculty for the personnel development in legal sciences, from which notable Russian politicians Igor Artemyev and Sergey Mironov have graduated.[citation needed]
In 1998, Kropachev initiated the first law-school clinic in Russia. The same year, he was elected dean of the Saint Petersburg State University Faculty of Law.[2][3][4] In 2000 he obtained a Doctor of Sciences degree in law and in 2003 he became full professor at the Criminal Law Department.
From 2000 to 2005, he headed the newly established Charter Court of Saint Petersburg, a single instance court meant to hear cases relating to conformity with the Charter of Saint Petersburg of regional law adopted by the Legislative Assembly of Saint Petersburg and decrees of the Governor of Saint Petersburg.[5][6][7]
From 2001 to 2010, Kropachev headed the Criminal Law Department. In 2006–2008, he concurrently served as the university's First Vice-Rector.
On May 21, 2008, Professor Nikolay Kropachev succeeded Lyudmila Verbitskaya as the Rector of Saint Petersburg State University.