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Brand is a proponent of IQ testing and the general intelligence factor and was "a major influence in the spread of influence of inspection time as a theoretically interesting correlate of psychometric intelligence," according to Ian Deary and Pauline Smith in the International Handbook of Intelligence, edited by Robert Sternberg.
They found worthy successors in later years — Maxwell, Fraser, Clark, Nisbet, Hope, Dockrell, Patricia Broadfoot, Spencer, John Raven, Ian Deary.