丹·格尔德特在明尼通卡高中担任乐队指挥长达35年。明尼通卡是他唯一任教的地方。他在奥古斯堡学院攻读音乐学位期间，就在明尼通卡学区进行了实习教学，随后休假一年，前往科罗拉多大学攻读音乐教育硕士学位。
在明尼通卡公立学校任教期间，丹通过多个音乐团体激励了数千名学生，其中包括管乐团、啦啦队乐队和行进乐队。他创立了明尼通卡爵士乐团，该乐团曾亮相明尼苏达爵士电台，在达科他爵士俱乐部演出，并经常与受邀的专业爵士乐手一起排练。他曾与多克·塞弗伦森合作，丹的一名学生肯尼·霍尔曼也曾与多克·塞弗伦森合作。 丹的另一位学生阿莱格拉·林戈是明尼苏达边缘艺术节的组织者之一，该艺术节致力于展示当地表演艺术家的才华。
摄影是他的另一项爱好。他说：“从记事起，我就对‘观察’充满兴趣。如今，我乐于尝试用相机捕捉这些景象。明尼通卡摄影俱乐部的成员们给了我很多启发和帮助。”
丹于2002年退休后，创立了明尼通卡管乐团，这是一个面向成年人的社区音乐团体。丹将对音乐的热爱传授给了他的学生们，这一点从明尼通卡管乐团的许多成员都是明尼通卡高中的前音乐学生这一事实中可见一斑。丹每年都会从科罗拉多州科林斯堡的家中往返五次，为明尼通卡社区的两场演出指挥排练。
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