Lambert's side sit only one place outside of the relegation zone, with a three point gap between themselves and Wigan who have a game in hand.
The Scot believes that the American owner is the right man to take the club forwards as they fight for their survival with nine games of the campaign remaining.
Fans of the Villans have grown more and more frustrated with the owner as the season has progressed; asking for further investment in the squad which has struggled to compete.
"I think Randy gets unfair criticism, I really do, for someone who has done one hell of a lot for this club," Lambert said. "He has done incredible things for the football club.
"I have got a really good relationship with the chairman here. He has been brilliant with me and so has [chief executive] Paul Faulkner.
"Randy was over [on Thursday] and he is what he was from the day that I met him. He has always been straight and honest. He has been very good with me."
Aston Villa last week