Girard is widely known for his contributions in the field of American textile design, particularly through his work for Herman Miller (1952 to 1975), where he created fabrics for the designs of George Nelson and Charles and Ray Eames.
His work also includes designing the La Fonda del Sol Restaurant in New York (1960), the Herman Miller Showplace: T&O (Textiles and Objects) (1961), Braniff International Airways (1965), and the Girard Foundation (1962), which houses his extensive folk art collection.