This book proposes that sigfluence, a new word coined by John Loase to mean positive, significant, long-term interpersonal influence which the New York Times featured as one of the new concepts that emerged from Harvard's 1984 International Conference on Thinking, is a fundamental motivation of a person, similar to Viktor Frankl's will-to-meaning. The work first introduces anecdotal and biographical accounts of sigfluence, notably the influence that shaped the lives of Lee Iacocca, Mother Teresa, John Kennedy, and Ronald Reagan. The next three chapters explore the sigfluence in relation to psychology, language, and the world of work. The seventh chapter suggests specific ways by which society should heighten its sensitivity toward long-term influence. The writing concludes with extensive applications of sigfluence to the personal life of the reader. Contents: Preface; Introduction to Sigfluence; What is Sigfluence?; Language; The World of Work; Sigfluence-My Early Findings; Sigfluence of Great 20th Century Figures; Altering Course-Society; Altering Course-The Individual; Appendix; Endnotes.