Student of many disciplines without the negative connotation of "Dilettante"? [duplicate]

What's a word for a person who studies many subjects? Often, the words we use to describe this type of person implies that he/she knows little about each subject (e.g. jack-of-all-trades, dilettante). I'd like to avoid that negative meaning.

e.g. Steve was a true ________; he was well-versed in everything from theoretical physics to gastronomy.

Solution 1:

Per Wikipedia:

A polymath is a person whose expertise spans a significant number of different subject areas.

You could also use Renaissance Man to hearken back to the time when being a generalist didn't make you a ""jack of all trades, master of none". Notice that Wikipedia redirects "Renaissance Man" to "Polymath".