Teague designed several notable show cars and production vehicles, including the Packard Executive, many AMC models, such as the Pacer, Gremlin, and Hornet, as well as the Jeep Cherokee XJ.

After Chrysler bought American Motors in 1987, he also designed or assisted in styling later automobiles, such as the Jeep Grand Cherokee ZJ and the Neon.

He lost several teeth and suffered a broken jaw, as well as sight in his right eye (leaving him without depth perception or stereoscopic vision), while his mother was left an invalid.

[6] While attending grade school in Los Angeles during the 1930s, Teague built model airplanes before turning to hot rods, since his schoolmates included Ed Iskenderian, a hot-rodder and later automotive entrepreneur, and land speed racer Stuart Hilborn, as well as other car enthusiasts.

[4] After graduating from Susan Miller Dorsey High School in 1942, he worked as an aircraft technical illustrator for Northrop Corporation.

[10] The restyled Packard line for 1955 showed Teague's keen eye for detail and ability to produce significant changes based on limited budgets.

Teague's first assignment, according to designer James W. (Jim) Alexander, was to re-do the front sheet metal on the 1961 Ambassador.

[16] With the ascendancy of Teague in the early 1960s, "AMC Styling began to be written in a more positive manner" within the industry and automotive press.

Designing several different cars from existing AMC stampings, he worked "relative miracles" compared to the spending norms in this industry.

The AMC Cavalier was one of the "Project IV" concept cars in the mid-1960s that demonstrated advanced techniques of interchangeable body panels and design symmetry.

[21] The right front and left rear fenders were identical, as well as the panels for doors, hood, and deck lid all interchanged.

"[23] While the 1965 models were reskinned and rode on a longer wheelbase, Teague "came through handsomely with crisp, angular lines" that helped the Ambassador achieve record sales.

This design evolved from two AMX prototypes that were part of the "Project IV" concept cars during the 1966 automobile show circuit.

[25] Other top executives, such as Robert B. Evans, wanted Teague's two-seat AMX design to be brought to the market "very quickly.

"[26] The new models' offerings reflected AMC's strategy to shed its "economy car" image and appeal to a more youthful, performance-oriented market.

[32] Together with Brooks Stevens, Teague presented ideas about future cars and vehicle technologies at the 1963 SAE congress in Detroit.

Teague was also responsible for many concept cars and lobbied for the production of several, including the compact Tarpon that ultimately led to the large Marlin.

[38] Teague also designed the "Concept 80" series of show cars, built on variations of existing AMC platforms as ideas for possible future models.

[39] The AMX/3 is one of the most unusual cars to come out of Detroit in the late 1960s featuring an internationally sourced components, a top speed of 160 mph (260 km/h), and potentially the Ford Pantera as its closest competitor.

[40] Teague was instrumental in moving the car to production at a reasonable cost, but upcoming U.S. bumper regulations and other issues would have inflated its price beyond volume viability.

The Cherokee XJ was described by one automotive magazine in 2009 as "possibly the best SUV shape of all time", and was the last Teague design to go into production.

"[45] Starting in 1982, Teague worked on the first large cars sold by AMC since 1978, the front-drive sedan code-named X-58, for introduction in late 1986.