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August (Gus) Juergen Koll was 23 years old when he left his native Denmark and came to America in 1882. He brought with him a love for woodworking, and the different varieties of woods and effects that they produced. The fascination with woodworking led him to his vocation, first as a carpenter and operator of a small joining shop which became the A. J. Koll Planing Mill in Los Angeles. His associations with the lumber industry and the growing popularity of the Los Angeles area led Gus Koll into a natural progression of events that brought him into the building of finely crafted custom homes and commercial construction. A.J. Koll passed his love for exotic woods and woodworking onto his son…

Harvey W. Koll… and with that came more involvement in the building industry. Harvey opened his own wholesale lumber business in 1921. During the depression he kept the business going by filling in with a variety of other jobs. As times got better, the lumber business got healthier and Harvey did some residential and commercial development just as his father had. During World War II he started his own lumber mill and aided the war effort by manufacturing sugar pine plugs for plugging bullet holes in amphibious vehicles. In 1961, Harvey was elected International President of the Wholesale Lumberman's Association, and was a member of The Hoo Hoo Club 155 in Coeur d'Alene, Idaho. He continued in the building trade by developing industrial property and later passed his talent and experiences on to his son…

M. H. (Mike) Koll with two generations of the building industry involvement behind him, was a natural to follow in the footsteps of his grandfather, August, and his father, Harvey. After graduation from college, Mike served his country as an enlisted man in the air force and later as a Lieutenant in the Pacific as a Combat Engineer. After his military service, he returned to the construction industry as a carpenter, building commercial and industrial buildings, then moved to operate a split timber and shingle mill in the California redwoods. His experience continued to grow superintending the construction of residential homes. In 1960 he formed his own successful building company. To this day Mike continues the family legacy, after being involved in building over 3500 residential units, he now shares his experience with the fourth generation of family builders, his son…

William J. (Bill) Koll who began at an early age working for his dad, became more infatuated with cars than the building industry. Leaving college, he began working in an automobile dealership and driving racecars… but, building is built into the Koll family. In 1972 Bill formed his own construction company and car racing became a hobby. He succeeded in both by winning his division at the 24 Hours of Daytona two years in a row, and continuing the building legacy, in California, by developing, designing and building several award winning communities. His dedication, attention to detail, patience, love of construction and natural talent are apparent in all that he does. Bill continues the Koll family tradition of quality and craftsmanship in North Idaho, designing and building exquisite custom homes.

Gregory S. Koll who worked with his father's projects at an early age but turned his eye towards the emerging digital industry. Greg worked with new technologies and new media, encompassing web technology, digital video and the design industry. Feeling the lure of the wood grain in his blood, Greg formed his own construction company in Southern California. Pulling from the vast resources of his long family history and the determined drive that made his other companies a success, Greg continues the Koll building legacy. Koll Builders Group develops raw land and builds custom residential homes and commercial projects in beautiful Southern California.

A family history of over one hundred years in the construction industry. The business then, as now, is to allow no compromise in the quality of workmanship or amenities, no matter the size of the project. Rainbow Mountain Development continues to serve its customers in the proud tradition of the Koll family of builders.