Teemu Keisteri, born on August 22, 1985, is a Finnish visual artist and DJ renowned for his alter ego Windows95man. His creative journey began gaining traction in Finland with the inception of the character Ukkeli (translated as 'Old man') in 2008, establishing him as a prominent figure in the visual arts scene.

Drawing inspiration from the aesthetics of the late 1990s, particularly the era of the Windows 95 operating system, Keisteri infuses his DJ performances with a distinctive artistic style and appearance. He is slated to represent Finland in the Eurovision Song Contest 2024 with his track "No Rules! “featuring Henri Piispanen.

Keisteri's artistic prowess extends beyond DJing; he pursued photography at the Institute of Design in Lahti, where he discovered his inclination towards visual artistry over conventional photography. Additionally, he's recognized as a video artist, dance performer, and proprietor of his own art gallery, Kalleria, located in Kallio, Helsinki.

Under the moniker Windows95Man, Keisteri, alongside Henri Piispanen on vocals, participated in the 2024 edition of UMK (Uuden Musiikin Kilpailu) with their song "No Rules!". Despite finishing last in the jury voting, his compelling performance resonated with the Finnish audience, propelling him to victory with 313 points from the televote, securing his place as Finland's representative in the Eurovision Song Contest 2024.

The song "No Rules" stands out as a spectacular entry, reminiscent of the bold and eccentric style seen in last year's entry by Käärljä. Singer Teemu Keisteri adopts the name of the iconic software brand Windows95, a clever nod within the guidelines set by the EBU, though without showcasing the logo. His outfit is equally attention-grabbing, featuring overly short denim shorts paired with a well-worn t-shirt adorned with the logo, topped off with a peaked cap. With his long hair and glasses, he embodies the quintessential computer nerd of the 1990s, seemingly glued to his computer screen.

The song itself is a lively pop tune with an infectious chorus that leaves a lasting impression. Its message is straightforward – there are no rules, and Keisteri unabashedly embraces individuality, disregarding others' opinions or societal norms. The stage performance during the Finnish national final was nothing short of breath taking, promising a memorable experience for viewers of the Eurovision Song Contest.