Since 1969, Larson has been with Hoard's Dairyman, first serving as associate editor before being named managing editor in 1998. In 2013, he transitioned to a new role as the editorial consultant. During his time with the magazine, he has been invited to make presentations in 29 states, three Canadian provinces, and Mexico.
His duties include preparing editorial commentary and Washington news. Larson is responsible for the magazine's coverage of milk marketing and dairy policy, dairy product promotion, feeding and nutrition, and mastitis and herd health. He has campaigned vigorously for a strong, dairy-farmer-funded product promotion and research effort, as well as supported national, voluntary, industry-controlled programs to improve incomes of U.S. dairy farm families. He also works closely with the 350-cow Hoard's Dairyman Farm.
Larson has served on advisory committees for the National Dairy Leaders Conference, Western Dairy Management Conference, the U.S. Forage Research Center, USDA's Agricultural Research Service, and is a former director and past president of National Dairy Shrine.
Larson holds degrees from Kansas State University and the University of Wisconsin-Madison.