[citation needed] At the time of the founding of Belgrade University in 1905, he was elected as an associate professor.

[citation needed] In 1895, Sima Lozanić, a fellow chemist, drafted a secondary textbook for chemistry, which Leko was asked to review.

[2] His teaching posts included: In 1897, Leko was the Manager of the Government Chemical Laboratory in Belgrade.

He was replaced in approximately 1907 at his own request, given he would be absent from the country while performing the role of President and Chief Manager of the Balkan Exhibition in London.

Leko also authored a report on the Society's activities: 'A Contribution to the Development of Applied Chemistry in the Kingdom of Serbia' (1906).

Before being renamed after him, the street bore the name Golden angel after the little family store owned by his father.