Vishnevetsky is replacing the previously announced Elvis Mitchell, the show announced Tuesday. No explanation was given for Mitchell's departure.
Ebert lost his ability to speak after cancer surgeries, but will be on the weekly show with a segment in which he communicates with a computer-generated voice. He will executive produce the series in Chicago with his wife, Chaz Ebert.
"Ebert Presents At the Movies" premieres Jan. 21 on public TV stations.