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Born in Sans Souci, Trinidad, Mannette as a young child developed a passion for metal and tools for metalworking, and would become engaged in the evolution of the phenomenon of sounding steel. At the age of 11, he was a member of Alexander's Ragtime Band created by Alexander Ford. From the middle of the 1930s, percussion bands of different quarters of Port-of-Spain were in competition with each other. Legend says that Mannette was the first person to use a discarded oil barrel to build a steel pan: "He sank the lid to create a tensed playing surface and fired the metal to improve the acoustic properties." From about 1939 to 1941, he performed with his own band, the Oval Boys (the name taken from the oval sports pavilion opposite the band's rehearsal space).
In 1951, TASPO (Trinidad All Steel Percussion Orchestra) traveled to Great Britain to present the new musical instrument at the Festival of Britain. Mannette was a member and tuner for this orchestra, which consisted of leader figures of different Trinidadian steel bands.
In 1948, Mannette was formally offered a scholarship to study music in London which he turned down in order to be able to build more steel pans.
After having visited the United States in the beginning of the 1960s to build up the US Navy Steel Band,  he was invited to New York City to build instruments for an inner city youth program. This invitation had been carried out by Murray Narell, a New York social worker and father of Jeff and Andy Narell. At this time, Mannette tuned his instruments by ear. Eventually he learned about the necessity of concert pitch A440Hz and the use of strobe tuners.
Since 1967, Mannette has been building up several hundred steel bands all over the United States mainly in colleges and universities, but also for private institutions. In 1991, he was invited by West Virginia University to show interested students how to build and play steel pans. What was meant to be a guest-semester eventually turned into a longtime relationship called the University Tuning Project and later on the company Mannette Steel Drums.
“I always knew in my heart one day
that my work would find its way,
I could not tell you how,
there was no one there for me to show the way
but I figured it out.
I figured it all through for all of you to see today.”
Mannette was credited with several innovations which have proven to be essential for the evolution of steel pan. He was the first to use a 55-gallon oil barrel instead of biscuit tins or soap boxes. Furthermore, Mannette was the person to sink the top of the drum into a concave shape, thus having more space to place notes as well as achieving a better isolation between the different pitches. Ellie Mannette has developed many instruments of the steel pan family. His use of the whole tone scale on two resonance bodies has become a widely common standard.
Mannette developed his own unique skills and style over many years. Within the University Tuning Project at West Virginia University in Morgantown, West Virginia, US, he passed on his knowledge of pan building and tuning to many students, thereby ensuring that his experience is passed on to future generations of pan makers. His creations can be admired in many museums and galleries including the Smithsonian Institution, the Metropolitan Museum of Art, and the Contemporary art gallery in New York.
In 1969, Mannette was awarded the Hummingbird Medal (Silver) of Trinidad and Tobago for his innovations in pan making. For more than 30 years, he was at the forefront of the steelband movement in the United States, and in recognition of his significant contribution to this thriving art form, he received the 1999 NEA National Heritage Fellowship Award, the highest honour for the traditional arts given in the US. Also in November 2000, he was awarded an Honorary Doctorate from the University of the West Indies and returned home to Trinidad, after a 33-year absence, to accept it. The same year he also received the Chaconia Medal Silver from his home country, for outstanding cultural achievement.
In 2003, Mannette was admitted to the Hall of Fame of the Percussive Arts Society of the United States, when he was quoted as saying: "Looking back more than half a century during my humble beginnings in this unique art form, no one during that period could have envisioned the rapid growth of this instrument. Through the years as I developed my skills, my entire mindset was sharing my knowledge with others for the betterment of this instrument."
- Lisa Rogers, "Elliot 'Elie' Mannette", Hall of Fame, Percussive Arts Society, 2003.
- "Elliott 'Ellie' Mannette, Morgantown, WV, Steel Pan Builder/Tuner/Player", 1999 NEA National Heritage Fellowships, National Endowment for the Arts.
- on YouTube
- "Unitpages Landing Page". Military.com. Retrieved 2 September 2018.
- "Concert pitch". Rhythmicalsteel.com. Retrieved 2 September 2018.
- "WVU concert to honor steel drum pioneer Ellie Mannette", WVU Today, West Virginia University, 1 April 2008.
- "Ellie Mannette dies at 91 - Trinidad and Tobago Newsday". Newsday.co.tt. 29 August 2018. Retrieved 2 September 2018.
- Norman Darway, "We cannot forget Ellie Mannette", TrinbagoPan, 23 February 2005.
- Percussive Arts Society
- History of Pan by Rhythmicalsteel
- National Endowment for the Arts
- Tiffe, Janine. "The Arrival of Steel Pan in the United States" in Percussive Notes, the journal of the Percussive Arts Society (45, no. 3, June 2007, pp. 10–16)
- Felix I. R. Blake: The Trinidad and Tobago Steel Pan. History and Evolution. ISBN 0-9525528-0-9
- Nurse, A. Myrna: Unheard Voices: The Rise of Steelband and Calypso in the Caribbean and North America. iUniverse, Inc. ISBN 978-0-595-40153-6 (pbk)
- "Ellie Mannette ... Continuing the Legacy", Mannette Musical Instruments.
- "Ellie Mannette Speaks - The Steel Drum an Art Form". YouTube video.