Gennady Vladimirovich Borisov is a Crimean telescope maker and amateur astronomer best known for discovering the first confirmed interstellar comet, 2I/Borisov, in August 2019[1][6]. Born in the Crimean Peninsula, Borisov’s early interest in astronomy was sparked by science fiction and a childhood fascination with space, which led him to build his first simple telescopes as a teenager[2][4]. He pursued formal studies in physics at Moscow State University, focusing on the astronomy faculty, but later shifted from academic research to practical optics and telescope construction[3][4]. Professionally, he works as an engineer at the Crimean Astronomical Station of the Sternberg Astronomical Institute of Moscow State University, where he maintains and operates telescopes, though he does not conduct professional astronomical observations himself[1][2]. Borisov’s most significant achievements stem from his amateur pursuits. At his private observatory, MARGO (Mobile Astronomical Robotics GENON Observatory), located in Nauchny, Crimea, he has designed and built several telescopes, including the GENON, GENON Max, and the 0.65-meter HGB-650 telescope[1][2]. Using these instruments, he has discovered multiple comets and near-Earth objects (NEOs), notably including the potentially hazardous asteroid 2013 TV135 and, most famously, the interstellar comet 2I/Borisov[1][2]. This discovery made him the first amateur astronomer to identify an object originating from outside the solar system, earning him international recognition and a place in the Guinness World Records[2][6]. The comet’s unusual composition has since provided valuable insights into the diversity of planetary systems beyond our own[5]. In addition to his 2019 milestone, Borisov continues to contribute to astronomy. In January 2023, he discovered the asteroid 2023 BU, which made an exceptionally close pass by Earth, further demonstrating his ongoing relevance in the field of NEO detection[1]. His work bridges professional and amateur astronomy, as his telescopes are now used at several observatories, and he collaborates with organizations like Roscosmos on experimental telescope projects[1][3]. Borisov remains active in both his engineering role and his personal astronomical research, maintaining a unique position as a skilled instrument maker and dedicated observer whose discoveries have expanded our understanding of the cosmos[1][3].