Following Loctav's leave from osu! management at the end of 2017, the Quality Assurance Team (QAT) elected QAT leaders to take control of the group. This decision was made because members of the QAT felt that Loctav and Ephemeral had too much control of the group, and that the QAT would be better led by its own members.
The vote for QAT leaders was handled through a vote of all Beatmap Nominators and QAT members. Results of the vote, found here, promoted Okoratu and JBHyperion as the first QAT leaders. Their responsibility was to work with the osu! team to maintain the mapping and modding communities.
By 2020, there was no need for a formal QAT (eventually Nomination Assessment Team (NAT)) leader position. The group is self-moderated currently.