Description of best SEO Agency - 39 Celsius Located in San Diego, California, 39 Celsius is a SEO firm that focuses on top search engine placement, and the talented team works diligently to meet the needs of all clients. The team of professionals at 39 Celsius focus on helping their clients develop effective Web strategies, which will help clients grow their businesses. The firm works with companies of all sizes, which include companies that range from 30 to 500 employees. The team has more than 35 years of combined experience working with small businesses and understands the importance of a strong business plan. The talented team of professionals at 39 Celsius provide their clients with coaching in Web marketing that will lead to growth and success. The team specializes in Search Engine Optimization, Pay-Per-Click, and Email marketing campaigns. The firm is an Online Marketing Certified Professional and is a certified partner for Google AdWords.