I suggest posting what you know about him including when he was born, when and where he died, to whom he was married and even children's names can sometimes help. Do you know when and where he immigrated? The more you post the easier it is to help you.
His obituary might mention the town where he was born and to a lesser degree his death certificate might also list it. If he had any siblings who also immigrated their obits and death certificates might list the town. Occasionally marriage records will list the town they were born in. In other words sometimes the best way to find out where someone was born is by looking at records of them long after they were born.