By the time he was 19 years old, he was a qualified designer working on stationary engines. His workshop manager, Gottlieb Daimler, then 29, noticed his efforts and took him on as his main assistant, a post he held until Daimler's death in 1900.
Around this time though Maybach suffered two setbacks. His teenage second son, Adolf, suffered a schizophrenia attack and spent the rest of his life in various mental institutions. (In 1940, his son was murdered by the Nazis as part of the Euthanasia Program.) In 1900, Gottlieb Daimler died of heart disease.
The prototype was finished in December 1900 and, in 1901 went on to have a string of racing successes. Its engine was baptized Daimler-Mercedes (Spanish for mercy) after Mercedes Jellinek, Emil's 10–year–old daughter. European high society bought the car in large numbers making it the commercial success that convinced the company directors there was a future in automobiles. Production increased greatly and DMG rapidly increased in size and number of employees. DMG officially registered the Mercedes trademark in June 1902.
In 1900, Maybach had had his first contact with Count Ferdinand von Zeppelin who sought to improve the engines of the Zeppelin LZ1 airship. Maybach built some engines for him based on sketches of a 150 hp unit created by his son, Karl, while at DMG.