[1] The first film Danailov took part in was The Traces Remain (Следите остават) when he was a child.

At that time he did not want to be an actor but in 1966, he graduated from VITIZ (the Bulgarian Theatre Academy).

His best-known work was as Major Deyanov in the series На всеки километър (At Each Kilometer).

He participated in numerous films and plays for which he won a lot of prizes.

[2] On 2 December 2019, The Bulgarian National Theater organized the biggest memorial service in Stefan Danailov's name.