As a former lead sales engineer for the fastest growing software company in history, I gave presentations from groups as small as 10 to as large as 6,000 - often without amplification. I currently still work in sales and often am able to utilize my voice to virtually close deals over the phone (it's impressive what a strong voice will do - honestly).
While I have yet to build a long list of experience in voice-over, I can supply recommendations from several individuals in the entertainment industry who have insisted I become active in this arena and on this website.
While I do not have any formal voice modulation training, I have been trained in public speaking in undergraduate classes at the University of Virginia as well as undergraduate classes at the University of Virginia's McIntire School of Commerce. I have currently been speaking publicly & professionally for over a decade now.
I am available immediately with the option of quick turnaround for pressing situations.