The Otago Polytechnic graduate (BPhEd) secured the six-month, unpaid role after sending his CV to 60 elite educational institutions around the world.
He left New Zealand in late January and is living with four Americans in a house 20 minutes from campus.
As well as working at the Harvard strength and conditioning facility, he is playing rugby for the Boston Irish Wolfhounds.
The move was initially "very daunting and exciting", he said.
Now, he was working with American football, ice hockey, softball, baseball, football, golf and field hockey teams and putting his Otago education to excellent use.
Harvard's set-up was "very professional", with its "world class facilities" including an inflatable dome which covered the main stadium field for winter training, an Olympic-sized swimming pool, basketball stadium, ice hockey rink and full track and field facilities.
However, in order to get through the 42 teams and 1500 athletes, work hours were long - from 6am-7.30pm on weekdays - and he had not time for any paid work.
Boston was a "very beautiful city" which also got very cold - day-time temperatures regularly dropped to -8degC during winter.
Home to 10 different universities, Boston was very student oriented and the "American equivalent to Dunedin", he said.
Despite all of this, Mr Stevenson was missing home.
"As I have settled in here, I have learnt to appreciate a lot of the simple things back in New Zealand, like being able to drive 10 minutes out of Dunedin and feel like you are in the middle of nowhere.
"I am definitely missing the countryside."
He had also become somewhat of a novelty.
Having never met a New Zealander before, many of the athletes had been "very curious" about him.
But there had been some translation issues with misinterpretation of common "Kiwi jargon" resulting in some interesting reactions, including "sweet as".
"They had a hard time understanding the reasoning behind our saying, so it took quite a bit of explaining."
Mr Stevenson's internship ends in July, after which comes the possibility of stepping up to assistant strength and conditioning coach, which would be paid work.