Which one is fuzzy on Mac, and which one is fuzzy on PC? Is the fuzziness consistent across all devices of those types you're able to test on - i.e. is the one that's fuzzy on your Mac fuzzy across all other departments' Macs?
What is the source of the logo you're using? On your main website, the only logo I can find is a 488x53 size image, which seems to be its native resolution. If the 1200 version of your logo was generated from that or a screencap of it, there'll be some inherent fuzziness that some devices' displays may exacerbate. Even in your Library, I can see some fuzziness on the 1200 version, like it's been slightly blown up. Are you able to grab a higher res version of your logo from anywhere else, or does your department, college, or facility have a library of logos at various resolutions?
I also tried compressing your 1200 logo as far as file size, to see if that would positively affect its appearance. If you're able to, try seeing if the compressed logo (will be most recent upload with a -min on the end) will show properly on your PC, Mac, and mobile devices.
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