About Us Lonabaugh & Riggs, LLP is Sheridan, Wyoming's senior law firm. Established in 1890, the firm has a longstanding tradition of providing excellent quality and economically efficient legal services, with an emphasis on personal injury, insurance, estate planning, business planning, litigation, natural resources, and oil and gas. Firm members have extensive administrative and litigation experience, combining aggressive advocacy and a thorough understanding of state-wide practice to best serve our clients' needs. The attorneys at Lonabaugh & Riggs, LLP are admitted to practice before all federal and state courts in Wyoming, Colorado, and Montana, as well as before federal and state agencies. Call us today.