He appeared on CNBC's Squawk Box this morning.
Among other things, he addressed questions about the NASDAQ's opaque communications.
"I disagree that we didn't communicate properly," said Greifeld.
He added that he and his management team was in constant communication with industry players.
But this did no good for the average retail investor who was waiting for some updates on what was going wrong.
And
During the CNBC appearance, Cramer tweeted: "How can Greifeld say they halted things to help the retail investor but then didn't communicate to the press. WRONG WRONG WRONG!"