Lisa Frank (the company) was around before 1989 so it's obviously not her. No doubt yet another case of seeing a name in the directory and while it is A Lisa Frank, it's not THE Lisa Frank.
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It is all 33girl's fault. ~DrPhil
If you scroll down to the bottom of the page, there are links to threads that Jamesmom made about a Lisa Frank who was a well-known DPhiE but says it wasn't the artist Lisa Frank.