Charles Sheffield 
Compleat McAndrew [EPUB ebook] 

The brain of an Einstein – the mind of an engineer…Presenting the space adventures of Arthur Morton Mc Andrew, space-time expert and scientist extraordinaire, and his long-suffering companion, spaceship skipper Jeanie Roker. Jeanie first met Mc Andrew on a routine run to Titan and quickly learned he was a genius of the caliber of Newton and Einstein. When Mc Andrew invented a space drive that let frail humans survive hundreds of gravities of acceleration, he disappeared while testing it, and Jeanie had to find him, using a trail of cryptic messages he had left behind.That was the beginning of a beautiful friendship, in spite of the gray hairs that Jeanie began accumulating as a result of Mc Andrew’s impractical nature and his talent for getting himself into trouble with much more practical villains…