Kathryn Felicia Day, born on June 28, 1979, in Huntsville, Alabama, is an American actress, singer, writer, and web series creator. She is celebrated for her contributions to the entertainment industry, particularly as a pioneer in online media and her work within the geek culture community. Day gained widespread recognition for her role as Vi in the iconic television series Buffy the Vampire Slayer in 2003, a series that has amassed a dedicated following and continues to influence the genre.

Growing up in a military family, Day was introduced to a variety of cultures and experiences, which shaped her creative pursuits. She attended the University of Alabama, where she studied mathematics and music, ultimately earning a degree in music performance. After college, she moved to Los Angeles to pursue acting, where she quickly began landing roles in both television and film. Her early work included a part in the film Bring It On Again in 2004 and a memorable appearance in the Internet musical Dr. Horrible's Sing-Along Blog in 2008, which further solidified her status within the online entertainment community.

Day's most notable achievement came with the creation of her own web series, The Guild, which she starred in and produced from 2007 to 2013. The show, which reflected her experiences as a gamer, became a groundbreaking success and is often credited with helping to pave the way for other web-based series. This innovative project showcased her talent not only as an actress but also as a writer and producer, earning her a loyal following and critical acclaim.

In addition to her work on The Guild, Felicia Day contributed to the gaming and fantasy genres with her role as Dr. Holly Marten in the sci-fi series Eureka in 2011 and as Charlie Bradbury in the long-running series Supernatural from 2012 to 2015, and again in 2018 and 2020. She also played Kinga Forrester in the revival of Mystery Science Theater 3000, which began airing in April 2017, showcasing her versatility and enduring appeal in the entertainment landscape.

Beyond her acting career, Day co-founded the online media company Geek & Sundry, which became known for popular programming including the acclaimed show Critical Role. Her involvement with Geek & Sundry played a significant role in promoting tabletop gaming and geek culture to a broader audience. Furthermore, Day served on the board of directors of the International Academy of Web Television from December 2009 until August 2012, further cementing her influence in the web television space.

As of now, Felicia Day continues to engage with her fanbase through various projects in acting, writing, and content creation, remaining a significant figure in both the traditional and digital entertainment realms. Her unique blend of creativity, humor, and passion for geek culture has endeared her to fans worldwide, making her a beloved icon in the industry.