I'm not sure that Og handles ICO escrows (his thread doesn't mention anything about it + I haven't seen him do it before), and if he doesn't, I know that
SebastianJu is a trusted escrow provider who provides ICO escrow services for no fees.
I also want to recommend you to use
SebastianJu here his
https://bitcointalk.org/index.php?topic=1102721.0 ANN thread. Ask him he will surely help you. He is one of the most trusted guy over here. And you can trust him for 100+ BTC
Good luck with your project