Nikolay Kolev started working with the Bulgarian National Television (BNT) in 1965 and from 1974 he was an editor-in-chief in the sports department.

Due to his popularity as a commentator he was usually associated with the Bulgarian football championship especially when it comes to the traditional derby between Levski FC and CSKA.

His colourful expressions were embraced throughout the country of Bulgaria and people frequently adopted quotes from some of his commentaries in daily speech.

Memorable quotes of his are: "...the colleague Pelé next to me..." (when the famous Brazilian footballer commented for some television in the booth next to the Kolev's) and "...God is Bulgarian..." (when Kostadinov scored a crucial goal in the last minute of the match between France and Bulgaria that qualified the Bulgarian team for the 1994 FIFA World Cup).

After leaving Bulgarian National Television, in the mid 1990s, Michmana worked for a while with Diema vision.