To contact Summit Credit Union for general questions, comments, help or ideas send us an email at stephanie.grenzer@summitcreditunion.com. Your campaign coordinator on site at Summit Credit Union is Stephanie Grenzer. Please contact Stephanie with questions at 608-243-5000 ext x3222 or stephanie.grenzer@summitcreditunion.com. Questions about Community Shares or pledging can be directed to Gray Miller at gmiller@communityshares.com or 608-338-1957. Summit Credit Union 1709 Landmark Dr. Cottage Grove, WI  53527 Phone:  608-243-5000 x3222 www.summitcreditunion.com Log in or register to see your payroll contact and/or coordinator contact.