I'm a huge proponent of utilizing speakers who've had to overcome the same societal and cultural hardships of the children and families within the community you're working with. No knock against clinicians who've studied resilience and have motivated social workers and others who work with children, but speakers who are located geographically and psychologically within the neighborhoods of children they serve are more relatable to community members in those neighborhoods and can be extremely effective in teaching other professionals who work with the same population.