On the occasion of the 300th anniversary (on April 15, 2007) of Elder's birth, an attempt is made to bring Euler's genius to the attention of a broad segment of the educated public. The three stations of his life-Basel, St. Petersburg, and Berlin-are sketched and the principal works identified in more or less chronological order. To convey a flavor of his work and its impact on modern science, a few of Euler's memorable contributions are selected and discussed in more detail. Remarks on Euler's personality, intellect, and craftsmanship round out the presentation.