Dmitriy’s professional activity started in 1995 with background in law and economics with successful realization in the areas of tax, contract law, investment activity, finances and securities. In 2005 Dmitry Mikhailenko launched his own tax practice which successfully developed into a law firm OMP Tax&Legal, later renamed to Crowe LF Ukraine, member of Crowe Global (2017). Dmitry Mikhailenko is known as an all-round lawyer with thinking outside the box. He is author of several draft laws on tax issues, 5 books, more than 500 publications, a speaker of more than 500 conferences  and other events on professional issues.

Dmitry actively participate in the work of public councils of the Ministry of Finance, the Verkhovna Rada Committee on Tax and Customs Policy, he is President of Association of Tax Advisors, the Chairman of the tax committee at the Ukrainian Chamber of Commerce and Industry, and advisor to the IT Committee of the European Business Association.