1895 – 1964
C.H. Langford (Clarence Huntington Langford, 1895–1964) was an American logician and analytic philosopher best known for his collaboration with C.I. Lewis on modal logic and for formulating the paradox of analysis. He made foundational contributions to symbolic logic and the theory of strict implication, and his work on temporal and modal reasoning shaped mid-twentieth-century analytic philosophy.
Co-authored 'Symbolic Logic' (1932) with C.I. Lewis, a foundational text in modal logic
Formulated the paradox of analysis (Langford's paradox): a correct analysis is uninformative, yet an informative one cannot be strictly correct
Developed early formal treatments of strict implication and modal operators
Contributed to the logic of future contingents and temporal reasoning
Influenced analytic epistemology through his precise treatment of the concept of analysis