One of my earliest UX wins was for Mac System 7. The Finder team wanted to truncate files names with '…' if it wouldn’t fit. I argued that too much critical info would be lost and suggested it be in the middle instead. The Finder team loved it and implemented it later that day. They were so easy to work with.

I'd totally forgotten about it until I overheard someone commenting it was an example of Apple's attention to detail. I'd didn't say anything at the time but yeah, that was me ;-)