Ivan Grieber

In the novel The Secret Adversary, Ivan Grieber is Kramenin's secretary.

When Julius Hersheimmer asks to see Kramenin, Ivan, whose business it is to "know everything", tells Kramenin that Julius' father was one of the steel kings of America, and that Julius is a millionaire several times over.

Ivan is sent down to receive Julius, and later brings him up to Kramenin's suite. However, Julius insists that he must see Kramenin alone, so Kramenin tells Ivan to take the night off, and go to the theatre.