People like allready offer consulting services via Skype, he is as “official” as you can get without being a direct employee of Epic. His thread is the in the Got work / Need Talent section. Contact him.
This service would not be cheap, Industry Studio wage for a Senior Engineer in my area, Austin Tx is $15,600 per month, which works out to about $94 an hour. That is the rate a Studio would charge per senior Engineer in fulfilling a contract on full-time work. That is with consistent 40 hour weeks. For a quickly filled short session of an hour or 2 the minimum possible fee would be much higher, because the Studio is going to need to provision for this engineer’s downtime. It would be $200 to $300 an hour at a minimum for a Studio to even consider this.
It would be much easier and cost effective, if you need this type of support, to contact an engineer directly who is advertising to do consulting / tutoring allready. Even if they are $100 ( I don’t know their prices. ) an hour that would be cheaper than would a Studio could offer.