If you are using the new Google Drive you can still search by owner!

Owner:emailaddress

Type the word “owner” followed by a colon. No space and then the email address of the owner. This will filter your Google Drive for all of the documents that are owned by that email address.

To:emailaddress

You can also filter by typing the word “to” followed by a colon. No space and then the email address. This will filter Google Drive for documents that are shared with that email address.

From:emailaddress

Instead of the word owner you can also use the word “from.” In other words, Google Drive is filtering documents that are from that person.