Peter Waage
Peter Waage (29 June 1833 – 13 January 1900) was a Norwegian chemist and professor. He was a professor of chemistry at the University of Kristiania. Along with his brother-in-law Cato Maximilian Guldberg, he co-discovered and developed the law of mass action between 1864 and 1879.

Biography
He grew up on the island of Hidra in  Vest-Agder, Norway. He was the son of Peder Pedersen Waage (1796–1872) and Regine Lovise Wathne (1802–72).    He attended the Bergen Cathedral School and studied chemistry and mineralogy at the University of Kristiania (now University of Oslo) under Adolph Strecker. In 1858, he received the Crown Prince's gold medal (Kronprinsens gullmedalje)  for  work on the development of the Theory's acidic acid radicals. He became a cand.real. in 1859. He subsequently  traveled to France and Germany, where he studied for two years including time spent with Robert Bunsen in Heidelberg.

In 1861, Waage was made an  associate professor and in 1866 he was appointed professor of chemistry at the University of Kristiania. He remained a professor at the University  over 30 years. He was also chairman of the Norwegian Polytechnic Society from 1868 to 1869, and the first chairman of the Norwegian branch of the YMCA when it was established in 1880.

Personal life
He was married twice. In 1862, he married  Johanne Christiane Tandberg Riddervold  (1838- 1869), daughter of Hans Riddervold (1795-1876) and Anne Marie Bull (1804-70). Following the death of his first wife, he was married in 1870 with Mathilde Sofie Guldberg (1845-1907), sister of Cato Guldberg.