Born and raised on Pale, Terl was the son of a traveling doctor that moved about the settlements of Pale's frontier communities. Trained by his father (while working as his assistant), Terl became familiar will care for all the Frontier races and the maladies that come from interacting with the flora and fauna on the frontier of a new world. As a youth he liked to spend his spare time ranging out into the wilderness and picked up an understanding and love of nature. His years of growing up on the frontier of Pale have made him strong and hardy, especially for a Yazarion, as well as quick and nimble. All are characteristics that served him well both as a medic and environmentalist. Having spent a lot of his free time alone and/or in the company of the "down-to-earth" members of society left his bedside manner a little rough, however.

Having come of age, he became bored with the family practice as the regions still served had become too "civilized" as the edge of the local frontier moved outward and he was looking for adventure in a more "primitive" setting. To this end, he signed on with the Second Volturnus Exploratory Expedition where he met his future wife Yala K'narr and a young Dralisite named Leelab Lar. Although they initially got off to a rocky start, Lee and Terl soon became fast friends. The rough adventures and close calls on Volturnus gave Terl plenty of opportunity to practice and expand his medical skills. Because of his experiences on Volturnus, where their medical supplies were always low, Terl always keeps a small mini-medkit with him at all times. While on Volturnus, Terl picked up some weapon skills as well as a surprising affinity for blowing things up.

In their many adventures around the Frontier, Terl continued to hone his skills and his ability to put comrades back together even in the heat of battle became somewhat well know around the Frontier and he has guest lectured at several medical schools around the Frontier on advanced field surgery. Along the way, in addition to developing his already existing skills, he also has pick up a certification as an Energy Weapons gunner qualified on all starship energy weapons systems.

Terl is now the CEO of Obar Enterprises, a multi-million credit corporation with various interests including freight hauling, mining and exploration.