Author of Conics, which introduced terms such as parabola, ellipse and hyperbola.

Article by J.V. Field.

From Eric W. Weisstein's World of Scientific Biography.

Feature on German mathematician who began his career as Plcker's assistant at Bonn.

Article by J J O'Connor and E F Robertson.

Includes biography, fields of study, and major contributions to geometry.

Major contributor to projective geometry. Discovered the Steiner surface which has a double infinity of conic sections on it.