I’ve done multiple Jeff Galloway plans to prepare for running events and his run walk run method has really helped with building endurance. This is a huge loss to the running community. https://www.runnersworld.com/news/a70444018/jeff-galloway-dies-at-80/
Jeff Galloway, Olympian and Pioneer of the Run/Walk Method, Dies at 80

After qualifying for the Olympic Games in the 10,000 meters in 1972, he went on to become an influential running author.

Runner's World