McDay is a strategic marketing communications firm located in Center City, Philadelphia. The McDay staff is a group of seasoned professionals, experienced in providing marketing communications services to clients in a wide range of businesses and industries, including pharmaceutical, biotech, chemical, and finance. Clients describe us as a technical ad agency. When the products and solutions are as complex as those found in pharmaceutical and biotech, or oil/gas and chemical manufacturing, or the multi-layered world of finance, or the newest high tech solutions, clients want to work with a marketing team with a lot of brains, who have literally lived in their world and thus, deeply understand their business.