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Incorrect comma usage, actually. You can't omit the Oxford comma (the comma before an "and") with a list of exactly 3 items. If you do, the middle item in the list can be parsed too many different ways, as happened here.

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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.

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 (…).

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