First, you need to find the locations of archives . Grodno state archive is one of them. Therere could be archives in Minsk, Vilnius and Poland too.

Go to the forum linked your earlier providing as much information as possible. Where he was born? Where he lived. His profession. When he emigrated. His religion.

Grodno governate : http://forum.vgd.ru/45/47679/

Ask if anyone is willing to help . Likely, you will have to pay for someone to go doing a search in archives for you.