> 
> You were born in Rome, when the Roman Republic was still in power.
>  Your father is an upper middle class merchant and you are (or will be)
>  the sole inheritor of his wealth. 
> 
> 
> One day, a mysterious stranger comes to town and offers your father
>  his services as a tutor. He possesses strange contraptions, has a
>  thick accent and is altogether otherworldly. You convince your father
>  to employ him and he begins to teach you chemistry and medicine at a
>  level unimaginable by your society (all the way up to our modern
>  understanding). 
> 
> 
> You study with him for 6 years and he teaches you all that he can.
> 
> 
> 

What can you do with this new found knowledge **given that you want to advance humanity as much as possible within your limited lifetime**?

Suppose that he teaches you up to the level of a modern doctor (M.D or PhD) and that you are 

* More or less benevolent (no megalomaniac tendencies)
* But not entirely selfless (a man's gotta eat!)

EDIT: I do know of the other question regarding the time-traveling average Joe going to Medieval Europe. My question is different in three ways:

* The character in question is not an "average Joe", he has sufficient familiarity with the customs and culture of his society and is relatively high up in it
* The time period is Ancient, rather than the Medieval/Dark Ages
* The knowledge conferred, is of a highly specific (Chemistry and Medicine) and advanced nature (M.D/PhD level) with sufficient thoroughness in the teaching to be beyond the realms of "average"

Seeing as many of the answers of that question deal with the stigma of being foreign (not speaking the language or knowing the customs) or just simple survival (given poor living conditions, and that the character has no wealth or status in that society) I think my question is different enough to merit consideration

In response to some of the answers, I feel I need to clarify things a bit:

* You are answering this question from the perspective of the native Roman (**not** the mysterious, possibly time-traveling, stranger). The mysterious tutor disappears as quickly as he arrives.
* 6 years may seem insufficient by today's standards of education, but keep in mind that these 6 years are not spent in a lecture hall listening to 1-3 hour lectures but on one-on-one tutoring sessions (6-8 hours/day) with a live-in tutor.
* Where tools are necessary to prove certain things (like microorganisms) that are also not to unwieldy (simple light microscope is easy enough to carry, TEM is not), assume the tutor had one but that the Roman does not.