This is one of my favorite tools to quickly track down someone that you are trying to reach. Typically, websites do not provide contact information for each employee, team member, etc.
If you know the first or last name of the person you are trying to reach it will make this tool super easy to use. It's not 100% effective but more often than not you will find what you are looking for.
Check out Hunter.io
You can sign up for a free account which will provide you with 100 free searches per month. You simply enter the domain you want to find an email for in the search bar.
The search will show you all of the email accounts at attached to the domain and the standard format for emails associated with the domain (fname@, f.lname@, etc). If you connect your Gmail account you can click to email directly from the page.
Hunter.io also has a Chrome extension so you can run the search while on the webpage that you want to look up.