Make certain you use Chrome browser and 2-step authentication.
Hackers leave behind (if they aren't smart enough) little tidbits of information. You have to do more than simply change your password. Prove yourself to Google, and you will be in the clear. That should fairly set forth your resumption of business activities. At a minimum you have certain obligations of integrity, and your account info, including all guys data, has probably been compromised. Maybe by a disgruntled wife, or by local law enforcement.
Go here for a review of your obligations to the guys here, and your responsibility to keep their data from prying eyes:
https://security.google.com/settings.../secureaccount
My Gmail account..
