The Seabourn Academy is a training program which exists in Seabourn's Miami offices and on all of its ships. Seabourn actually takes 4 suites, in addition to the regular crew space, for trainees to shadow the staff so that they learn on the job (without interfering with the job!) how to do things the Seabourn way.
The staff are actually quite multinational, but the vast majority are from Europe and South Africa. There are a few South Americans as well. Culturally and experientially there is a difference with most Asian cultures, so that the interaction with the guests is more engaged rather than quietly pleasing.
In the end, regardless of nationality, Seabourn trains it staff to be intuitive and to find ways never to say "No".