Dr. Luka Kovac is a fictional character from the television series ER, which aired from 1994 to 2009. He is portrayed by actor Goran Visnjic and is known for his skills as a trauma surgeon. Dr. Kovac is a dedicated physician who often faces personal and professional challenges throughout the series. Originally from Croatia, Dr. Kovac's character brings a unique perspective to the diverse staff of the County General Hospital in Chicago. His background and experiences shape his interactions with patients and colleagues, making him a memorable part of the show's ensemble cast.