He was very old at the time of his death, so the date of birth on his profile is wrong...I found the date of his death (and the information on his profile is correct)...Does anyone know what his date of birth is?
According to Naftali Vokstein, he was the grandson of the daughter of:
Rabbi Yaakov Landau Author of Ha'Agur
And this is because Rabbi Yaakov Baruch Landau was not from a Levite family