There are many paid services that allow you to get comprehensive lists of people working for specific companies. But the best thing is that some have a free component or pages that can be viewed publicly using Google.

The Google search script to search company contacts (name and title) from Zoominfo is

site:zoominfo.com inurl:people (keyword) "company"

For example to search for contacts of Directors at Sun Microsystems, the search script will be

site:zoominfo.com inurl:people (manager OR director) "Sun Microsystems"

Clicking on the results will display the contacts' name and their actual job title in the company. Use this script to quickly source passive candidates