Heinrich Sylvester Theodor Tiling (31 December 1818 in Wilkenhof, Livonia, now in Latvia – 6 December 1871 in Nevada City, California, US) was a German–Russian physician and naturalist. During his later years he became an American citizen. Early years His parents were Johann Heinrich Tiling and Margarete, née Pearson of Balmadis. He studied medicine in Dorpat from 1838 to 1844. He graduated and received a doctor's degree in 1844. Career Tiling became a physician at the "Russian North American Co." in Ayan, Siberia from 1845 through 1851. He went to Ayan over land with his young wife and arrived in winter 1845. The difficulties during the overland journey were extreme in parts. He published an account of it in see below. The German title of the book translates as: "A journey around the world from West to East through Siberia and the Pacific and Atlantic seas". During his time in Ayan, he kept a daily register of the temperature and rainfall for Ayan. He described all plants in the area and published an account of it with the director of the botanical gardens in St. Petersburg, Russia, Eduard August von Regel (Florula Ajanensis; see below). He went back to Riga with his wife and four small children and arrived early 1852. After that, he practiced medicine in Riga from 1853 to 1854. From 1854 to 1863, he practiced in Wenden and from 1863 until 1868, in Sitka, Alaska. He had settled in Sitka before the Alaska purchase. After it he stayed and later went on to San Francisco and Nevada City, California. He collected and described numerous plants and species in Siberia, Alaska, and California from 1844 to 1871 such as Tiling's monkeyflower, Mimulus tilingii, native to North America. Journey around the world Directly after having got the doctor's degree, he was offered a post with the Russian-American Company to become the company surgeon in their newly created port on the Okhotsk Sea, Ayan. He married in the spring of 1844 Anna Elisabeth Fehrmann. She accompanied him on the overland journey to Siberia. Tiling started to learn the Russian language during his travels. The journey was slow and obviously lasted longer than planned and it was already winter when they arrived. After a lot of trouble that ended very nearly deadly, they arrived in Ayan on 4 December 1844 and Tiling began his work. At the time of his arrival,