The best way to do it, I think, would be to forgo the hyphens completely and go with: I am a psychologist who works with children and adults. Anything else is awkward, ambiguous, or both. If it's necessary to emphasize that this individual works with children and adults (i.e., this isn't just introductory information), you could add in a 'both': I am a psychologist who works with both children ...
MSN: 15+ Places to Shop for Plus Size Halloween Costumes & Our Faves!
15+ Places to Shop for Plus Size Halloween Costumes & Our Faves!
Sexy doctor, sexy nurse, sexy cop, sexy superhero, sexy mermaid, sexy vampire. For various reasons, some themes seem to make sense for a "sexy" Halloween costume made for adults. Other "sexy" branded ...