Document Classes ⇒ [beamer] Add additional information to title page
[beamer] Add additional information to title page
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Re: [beamer] Add additional information to title page
\author{M.Y. Self\\[2\baselineskip]
Supervisors: So and So}
You'll have to fiddle with spacing to get what you want.
As for positioning, you could specify the layout of the titlepage by hand, adjusting spacing as you see fit with \inserttitle, \insertauthor, ..., \vspace, \vfill..., or completely redefine \titlepage yourself.