(I agree with Otomatonium's answer; just wanted to add some background information.)
Strictly speaking, the "example" given is not a sentence (it has no subject). However, since the comments above indicate that the context is a resume, I'll answer on that basis.
- it is correct to omit the comma
- the prepositions are correct
It is normal in a resume to list a number of bullet points which would all form complete sentences when prefixed by a short phrase, including the subject and possibly a verb. This phrase is easily deduced from the context.
In your case, the omitted understood phrase might be "Boris is...". All the other bullet points listed with this one should form complete sentences if the same phrase were supplied before them.
This type of outline structure, where each point supplies part of a complete sentence (of which the other part is the same for all points), is certainly not the only valid way to write a resume. It is one effective mechanism for maintaining parallel form.