There are excerpts and free chapters of each novel in its section here. You will find additional excerpts with each character.
Additional where to buy links are with each novel.

The Octagla Series
Tamara is going for the impossible, a three-peat of the Galactic Octagla Championship. Octagla is a fast paced hybid of hockey and lacrosse played weightless.
Thumbnail Cover Octagla 1: Slingshot Play a space sport novel by Donald S. Hall and Judi Suni Hall at Gingezel. Cover Octagla 2: Rematch gingezel scifi. Thumbnail.

The Gingezel Series

What do you do when your reactor overpowers, killing your best friend's husband and placing the entire mining colony in peril? Join Mitra, the reactor designer, Dreen, Joran and Chett as they deal with this accident.

5* Review at Barnes and Noble:
"GREAT FINAL BOOK. I loved this series and will miss all of the wonderful characters, good guys, bad guys and those in between."

Twelve years in the making, the epic Gingezel series is science fiction written by scientists. This series will appeal to the reader who is looking for real characters to get involved with, a mix of drama and romance, and a complex plot line that evolves throughout the series. There is a tendency to end each novel as a cliff hanger.

thumbnail of cover Gingezel 1: The Limit Sci Fi novel Thumbnail of cover for Gingezel 2: Bad to Worse sci fi novel. Thumbnail of cover for Gingezel 3: Fault sci fi novel. Cover Gingezel 4: Hacker science fiction by Judi Suni Hall and Donald S. Hall

The series, Gingezel 1: The Limit, Gingezel 2: Bad to Worse, Gingezel 3: Fault, and Gingezel 4: Hacker, explores a reactor accident on a remote mining planet across the galaxy. The books are written from the point of view of the designers of the power system and the analysts brought in to determine the cause of the accident.

Published as eBooks on:

Available as print books on

Coming further down the time line:

The Mugona series. This is the series we are currently working on. It explores quantum mechanical machine based sentient creatures.

Reflections on an empty planet Gingezel science fiction art.
Reflections on an empty planet.