Hi Everyone

I have a high performing engineer at my office. He has the tech skillset and knowledge to be a senior in our organization, but not the communication skills. English is his second language. So with high level design concepts and principles he often thinks in his native tongue and has an issue speaking to the abstract in English. 

What type of training opportunities could I target for him? Internally, he's going to be responsible for leading technical presentations, providing ongoing training to members of the organization outside of his direct team, participating in our software architecture review board. Basically, if he were to be promoted he'd be responsible for presenting these abstract technical concepts every day. Any ideas would be greatly appreciated.