Steve Curtis wrote:
Listing for photographer's assistants?  Really need an assistant familiar with newer Nikon cameras and strobes.

Steve in my market (as well as many other major markets) commercial shooters typically use the ASMP's Find an Assistant  In the aforementioned you'll find each member's Credentials: equipment proficiency (camera, lighting etc), Personal data, and References with contact information.  Many in this list are tenured commercial photographers with years of experience.

btw, the lion's share of my commercial assisting assignments come from the aforementioned ASMP list... Yes I'm a member in that list for Washington DC...  I personally recommend it to those seeking experienced assisting talent that not only have mastered the equipment but also have a keen sense of set etiquette... they are focused on your mission of meeting and exceeding your client's expectations...   

Hope this helps...

All the best on your journey...