In addition to The Hardy Boys, Svenson also contributed to The Bobbsey Twins, Mel Martin Baseball Series, Honey Bunch, Honey Bunch and Norman, and Tom Swift Junior. He also created his own series, including The Happy Hollisters (a mystery series based on his own children), Brett King (a “modern cowboy” series), The Tollivers (created in 1967, about a middle class African American family who solve mysteries), and The Wynn and Lonny Racing Series (about adventurous brothers from North Carolina who race cars and solve mysteries.)