There’s a joke often told regarding business partners: Q: What do you have when you’ve got a business partner? A: One too many partners. Want to read more? Subscribe to continue reading this article, plus gain access to all DERMASCOPE has to offer. SUBSCRIBE Douglas Preston’s career spans 38-plus years in professional aesthetics, spa management, and skin care career mentoring. His business articles appear in many of the top trade journals and magazines. He is past president of the Aesthetics International Association. His recently published book, “An Esthetician’s Guide to Growing A Successful Skin care Career.” It is a top seller among ambitious working skin care professionals. Preston has taught spa management techniques and professional improvement for spa therapists in the United States, Canada, Australia, and New Zealand. He also works with product distributors and manufacturers to enhance their sales skills. Preston practices aesthetic skin care in his prestigious Los Gatos, California studio, Preston Skin Center and can be contacted at This email address is being protected from spambots. You need JavaScript enabled to view it. or 408-677-6105. Want to read more? Subscribe to one of our monthly plans to continue reading this article.