• Was a Polish portrait and miniature painter.
• He was born to Michał Kosiński and Marianna née Jaraczewska.
• He later made a trip to Italy for further studies.
• Upon returning, he was appointed a court painter by King Stanisław II August.
• He was awarded the Medal Bene Merentibus and, from 1789, received a pension of 10 ducats monthly.
• From 1791 to 1794, he maintained a close professional relationship with Josef Grassi, an Austrian portrait painter.
• Most of his clients were among the minor nobility.
• He worked in both oils and watercolors.
• Antoni Blank and Józefat Ignacy Łukasiewicz were among his best-known students.
