My name is Ira Mark Egdall. I am a retired optical engineer and aerospace program manager from the Boston area. I now teach lay courses in modern physics at several Lifelong Learning Institutes here in South Florida.

I am also writing a book which explains special and general relativity in everyday language. It is for those who always wanted to understand Eisntein’s ideas but never thought they could. If you want me to notify you when the book is avaliable, please email me at: megdall@marksmodernphysics.com