His name is Wenbo Zhang. I just looked at a times guide I kept from our recent trip and his times from 23rd June - 29th June were:
11:45am - 2:00pm, 4:00pm - 6:00pm & 7:30pm - 8:30pm.
He’s there everyday except Wednesday but I guess that could change between now & when you go. We didn’t get a chance to see him because our Epcot days always seem to be a Wednesday haha