What is the best way to list multiple job titles on a business card?

Listing multiple job titles on a business card is highly discouraged because it can make it look cluttered. Most choose one that fits best, but usually stay away from 'Owner' and tend to side with 'Director' in a lot of cases.If you can find short ways to say the titles you need, it may fit. An example is:John DoeCEO/Director of Operations