Spencer-Brown was born in 1923. During the 1960s, Spencer-Brown and his brother worked for the British railways. They developed an electronic device to control the movement of the train. This device was working successfully, but in order to explain how it worked he decided to write the book "Laws of Form". The book was printed in 1969, after Bertrand Russell wrote the recommendation: "Not since Euclid's Elements have we seen anything like it".
The book Laws of Form is a solution to the challenge to find unity in mathematics, a vision that was originally declared by David Hilbert after the presentation of a list of 23 open problems in mathematics in his lecture in Paris in ICM1900:
"…The organic unity of mathematics is inherent in the nature of this science, for mathematics is the foundation of all exact knowledge of natural phenomena. That it may completely fulfil this high mission, may the new century bring it gifted masters and many zealous and enthusiastic disciples!" --David Hilbert 8.8.1900.
In September 2003, I participated in the conference about the unity of mathematics at Harvard university. It was for the celebration of the 90th birthday of the great mathematician, Israel Gelfand. At this conference the famous mathematician, Michael Atiyah, gave a lecture in which he declared that we are waiting today for the appearance of a new Newton that will break the enigma about the connection between mathematics and physics.
I had the great pleasure of meeting George Spencer Brown at his home on July 21, 2011. I had shared with him the abstract of my short communication lecture at the international conference for mathematics which took place in Madrid ICM2006, entitled "Various degrees of the number distinctions".