I have cliniced with Marina many times. I have also organized clinics for her. She is an excellent trainer, instructor and rider. She as someone already put it, is not everyone’s cup of tea, but information wise, riding/training wise, and instruction wise she is incredible.
Below is info that I had from her website, and previous clinics.
Marina began her riding career at an early age in Germany. Her equestrian instructors included such accomplished riders as Johann Hinneman, Herbert Rehbein, and Dr. Reiner Klimke.
In the early 1970’s, the Reitschule Genn GmbH in West Germany grew to become the principal center in Germany for the training and breeding of fine competition horses. Marina trained many of these young horses herself and proceeded to ride many to victory in the show jumping ring and three-day eventing course.
After her move to Canada in 1982, she continued to excel in the world of dressage competition. During her five competitive years in Canada, she placed 355 times, including 121 first places, 65 seconds, and 55 thirds. These accomplishments led her to attain such titles as:
1982 Canadian Grand Prix Reserve Champion
1983 Canadian Grand Prix Champion
1984 Ontario Basic Reserve Champion
1984 Ontario Medium Champion
1984 Ontario Advanced Champion
1984 Grand Prix Champion
1985 Ontario Medium Champion
1985 Canadian Champion, Eastern Division
1987 United States High Score Intermediare I
1987 Long listed Canadian Equestrian Team
In 1988, Marina moved to the United States to share her knowledge and experience.
AAES is her school-website is http://www.aaesva.com/. I am sure if you wanted to go watch her teach, you would be very welcome.