English speaking Historians? (Moscow)

Hello anyone. I am making a history documentary for Discovery (shooting in Moscow in a week Protected content July) and one of our interviews has dropped out at the last minute so I am urgently looking for a replacement - a good Moscow based English Speaking historian or qualified and informed guide who can talk about 19th century Russian history and Christianity. More Specifically about the New Jerusalem Monastery and Nicholas I. Any ideas on where I might find such a person on short notice? Help. - Stephen