Hi Tom

Some of the guys who have commented my have some contacts for you for good sprayfoam contractors. If not I found a few US groups that may be able to help. I have also listed the Canadian Association (CUFCA), which won't have members in the US but they likely know their US counterparts and could help.

SPFA
3927 Old Lee Hwy. #101B
Fairfax, VA 22030
Tel: (800) 523-6154
Fax: (703) 222-5816
http://www.sprayfoam.org/contact-us

or

https://polyurethane.americanchemistry.com/polyurethanes/Spray-Foam-Coalition/

In Canada

Andrew Cole at CUFCA may be able to direct you to someone
3200 Wharton Way
Mississauga, Ontario, Canada L4X 2C1
Toll Free: (866) 467-7729 (1-866-GO-SPRAY)
Toll Free Fax: (877) 416-3626 (1-877-416-FOAM)
E-mail: cufcaatcufcadotca