Authors and chairmen at the 20th Anniversary of Pierson/St Denis paper at Webb Institute of Naval Architecture, October 18, 1973, with their affiliations at the time: back row (left to right), Owen Oakley, Jr., Unlversity of California, author; Nils Salvesen, NSRDC, co-chaIrman; R. Wermter, NSRDC, Chairman; T. Francis Ogilvie, University of Michigan, author; D. Hoffman, Webb Institute of Naval Architecture, author; Vincent J. Cardone, City University of New York, author, and J. F. Dalzell, Davidson Laboratory, author. Middle row (left to right), Robert F. Beck, University of Michigan, author; Willard J. Pierson, Jr., City University of New York, guest of honor; W. E. Cummins, NSRDC, author and chairman, Panel H-7; Manley St. Denis, University of Hawaii, guest of honor, and B. V. Korvin- Kroukovsky (retired), chairman. Front row (left to right), Martin A. Abkowitz, MIT, author; R. B. Zubaly, Webb Institute of Naval Architecture, co-chairman; E. V. Lewis, Webb Institute of Naval Architecture, author; F. Sellars, MPR Associates, co-chairman; J. R. Paulling, University of California at Berkeley, author; and Michael K. Ochi, NSRDC, author.