Martin Hollmann is one of the world's leading aircraft designers. He us also an FAA Engineering Designee and helps certifies aircraft  and aircraft repairs and alterations, (STCs and PMAs).

Below are comments from friends:

Martin,  thanks for yourT reply. It's good to hear from you and I hope all is well. Thanks for all you have done for the sport aviation community over the years.  Best Regards, Jim Irwin (Pres. Aircraft Spruce & Specialty Co.).

Martin gave three forums at the Golden West Fly In in 2011. See Forums and Air-Shows. 

Hi Martin, I wanted to thank you for putting together a great book on aircraft design, I enjoyed it thoroughly, and I plan on utilizing it as a reference for my design I am working on. Chris Zupp, Cincinnati Ohio

Dear Martin, I really appreciate your collection of resources on your aircraft designs website. Best Wishes, Cate Newton, Manager, SR Education Group.

I have fond memories of camping under the wing of my Cessna 140 at the Watsonville Airshow in the late seventies and Marty would do dawn patrol with his gyroplane and wake everyone up. He was always willing to talk with me about motor glider designs and what he had on his drawing board. Keep 'em flying, Curtis Clark
 
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