Markus was bridge correspondent of "The Guardian" for 37 years and of the London "Evening Standard" after 1975, and she wrote a dozen bridge books including her autobiography. Generally recognized as the top European woman player, she was the first woman to become a WBF World Grand Master and was the leading woman in the WBF masterpoints rankings from their inception in 1974 until 1980. She was named International Bridge Press Association Personality of the Year in 1974, and was appointed MBE for contributions to bridge a year later. For many years she organized an annual match between the two Houses of Parliament.