Skip to Main Content


Since 1990, Sumption & Wyland has produced many resources to help our clients be more successful. 

Our resources include published articles and features, articles and monographs developed specifically for our web site, and book reviews for books of interest to nonprofit sector professionals.

Sumption & Wyland

Sumption & Wyland 605.336.0244 818 South Hawthorne Avenue Sioux Falls SD 57104 US 43.53825780 -96.74870030