John Duffner Your Point of Contact. Welcome to John Duffner's Business Services! The focus of John Duffner's Business Services is to work with small and medium size business owners.  Whether you are new to this site, or returning for a visit, I hope to provide you with timely and valuable information. As your business partner, I understand your need to save time and will work with you to find effective solutions for your business needs. I strive to build and maintain long-lasting business relationships, and this website is an extension of my  commitment to you. Please feel free to contact me for additional information about the firm and the services offered, or to make suggestions regarding the website. Perhaps there is something missing and you feel that it should be covered.....just let me know.  I look forward to speaking with you soon.  Call me at 805-933-1385.