Is there a program similar to Visio for the Mac?
If he really needs Visio then you could opt to run Windows via VirtualBox on your Mac. VirtualBox is free and you can download it here:
You may also want to consider creating a Boot Camp partition on your Mac to run Windows. More info on that here:
http://www.apple.com/support/bootcamp/
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You could also use Sketch or Autocad (which is overkill)
http://www.bohemiancoding.com/sketch
http://usa.autodesk.com/adsk/servlet/pc/index?id=15421056&siteID=123112
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www.omnigroup.com/products/omnigraffle
- available in std and pro versions
- imports/exports Visio .vdx (XML) format
- available for iPad too
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Omnigraffle is your best bet, for what you're looking. The standard version is $99. The Pro version, with Visio support, is $199, though - still cheaper than Visio's $249.
In the Pro version, in addition to opening Visio's VSD file, Omnigraffle will also open Visio stencil (VST) and Visio template (VST) files.
(I do not work for Omni. I do use a Mac, and Parallels whenever the job requires otherwise.)
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If your company is open to cloud apps, I'd encourage you to look at Lucidchart. Along with being like a Visio for the Mac, it's cross platform so it's also like Visio for iPad. It can import/export Visio files which makes things a bit simpler as well. Have not compared it directly to Omnigraffle though to tell you the key differences.