You can have multiple developers if you register as a company. You have three options:
Simply apply for a "Doing Business As" from your state clerk
Register your company as an LLC, process varies by state, contact your clerk
Incorporate your company, this is the most expensive option, and has tax implications
Next apply for the standard program under that company name. Remember that this is the name your apps will be released under.
You will be required to mail proof of your company to Apple. It will take some time for your company to be approved, Apple pays to have a background check done to ensure the company is in fact valid.
Once you are approved you need your other developers to request certificates, here is a link from apple with that process: (requires login)
https://developer.apple.com/ios/manage/certificates/team/howto.action