Well, English is Germanic language and it's really not that hard to learn.
Although, they do speak slightly different German in Bavaria than that learned in most schools.
(people form northern parts of Germany hardly understand the dialect that is spoken in rural bavaria)
is an ambitious character that has high demands on himself. Therefore I am relatively sure that he´ll speak quite good German when he starts to work here. It is a part of his preparation for the new job and he is in the comfortable situation of having half a year to prepare.
Speaking German willnot be a problem as all German's speak excellent English anyway.