She was elected under the secret voting procedure. Tanasevych claimed 23 votes, with at least 20 necessary to pass the decision.
Her closest rival Olga Salandyak came second in the race, claiming only 10 votes of 20 necessary.
Tanasevych graduated from Kharkiv Law Academy named after Yaroslav the Wise. She's been working as the judge since 2012; her sister is also a judge who worked for the business court of Kharkiv region.
Olena Tanasevych will be chairing the supreme anti-corruption judicial authority for the next three years.
The law about the Supreme Anti-Corruption Court of Ukraine took effect in June 2018; it foresees that the authority should start working by June 2019. 38 judges were appointed by President Petro Poroshenko last month.