Dennis worked at Kenny's Auto Parts and Service in St. Ann, MO. His father Kenneth Eise founded the business. Three generations of Eise men worked side by side at the family business when Kenneth, Dennis and his son Tim were there. When Kenneth retired, Dennis bought the business and ran it until he retired and then Tim bought the business, keeping it in the family for over 50 years.

His passions in life were a love of the outdoors, hunting, fishing and exploring the woods. One of his greatest joys was hunting and fishing with his sons. He loved spending time at the country cabin with his wife and all of his children, grandchildren, great-grandchildren and friends. Denny enjoyed nothing more than having a beer and watching the Cardinals games with his wife.