I've known only one pair who've worked together because they're usually on different career paths. The ILI said that the LSE couldn't see outside the unnecessary tunnel that he was constructing for himself. The LSE was never so metaphorical; he said that although the ILI was knowledgeable, he was lazy as a cut dog (perhaps not his exact words) and that unproductive would be an understatement. I doubt that they've ever had a beer together but the project that they shared did actually produce a report, which was totally written by the LSE about the work that was solely done by ILI; the LSE left his position soon after.

a.k.a. I/O