[rabbidruster]

I beg to differ. I don't see how an oxford comma would fix this confusion. In fact I think without it his statement is easier to understand. We can easily see he means three people. If he used the Oxford comma the second person would look identical to a preposition and would make your parents comment more valid.

[p4bl0]

The easiest way to fix the sentence is to put the least precise term at the end + using the oxford comma.

> Having interviewed Timothy May, Phil Zimmermann, and Cryptome founder is probably how (…).