Gundars Tilmanis "Til" is an internationally recognized tennis coach, author and lecturer. He graduated from the University of Oregon with a Master's Degree in Physical Education. Til is generally regarded as one of the top teaching clinicians in the world today. Known for his quick wit and extensive teaching background, he is a clinician for both the United States Tennis Association (USTA) and the International Tennis Federation (ITF).

Til is in constant demand as a speaker and has lectured at the USTA Tennis Teacher's Conference in New York, the USPTR International Symposium, and the USPTA International Convention. He has delivered a broad range of tennis related lectures to audiences throughout the world. During the past six years, he has lectured throughout the United States, Japan, Guatemala, Spain, Paraguay, Argentina, Canada and Australia. His innovative, energetic style of coaching has drawn praise throughout the tennis world.

Born in Riga, Latvia, raised in Melbourne, Australia, Til currently resides in Portland, Oregon.