Author - James Chen: Retired Department of the Navy and Federal Aviation Administration Radar and Surveillance Systems Engineer. Guest lecturer at local Washington DC/Northern Virginia/Maryland astronomy clubs on amateur astronomy topics of eyepiece design, optical filters, urban and suburban astronomy, and lunar observing. Author of an Astronomy Magazine article on Dobsonian telescope design in November 1989 issue. ... Read more First book, published in June 2014 by Springer, entitled How to Find the Apollo Landings Sites. Served as a part-time technical and sales consultant for two Washington DC area telescope stores for over 30 years. Graphics Designer - Adam Chen: Former Program Manager of media support for NASA Headquarters in Washington DC. Creator and executive producer of major NASA publications, including the book and web-book application documenting the history of the Space Shuttle Program Celebrating 30 Years of the Space Shuttle Program . Currently works in marketing for Brown Advisory, an investment firm in Baltimore, MD. Show Less