Jewett studied at Worcester Academy and Brown University and took his DD at the Newton Theological Institution. He sailed with his wife for India in October 1848 and reached Nellore in April 1849. The founder of the Telugu Mission in Ongole was Samuel S. Day. After Samuel S. Day, Jewett was the central figure of the Mission along with John E. Clough. The results of the mission were meagre and the home organisation repeatedly pressed for its closure. Jewett and his wife were home, sick, in America in 1862 when one such attempt was made to stop funding for the mission.
He learned Telugu from a Brahmin convert.
- Baptist missionary magazine: American Baptist Foreign Mission Society - 1897 "LYMAN JEWETT, D. D. THIS eminent and dearly beloved servant of God passed away from earth on Thursday, January 7, at the home of his daughter, Mrs. LM Davis of Fitchburg, Mass. For more than a year he has been very feeble"
- Henry C. Vedder A Short History of the Baptists 2009 p176 "the first Telugu version to be generally circulated was that of Lyman Jewett."
- George Winfred Hervey The story of Baptist missions in foreign lands 1884 p803
- The Baptist Encyclopedia - Vol. 2 ed. William Cathcart
- American Baptist Foreign Mission Society Baptist missionary magazine 1908 ""It was at this time," says Dr. Downie in his "History of the Telugu Mission," "that Dr. Jewett negotiated for the house and land which..."
- Emma Rauschenbusch Clough While Sewing Sandals: Tales of a Telugu Pariah Tribe 2000 p313 "During a period of thirty years the pioneers of the Telugu Mission believed that, " God has a great people among the Telugus," while but few cared for their message. Rev. Lyman Jewett, DD, visited Ongole repeatedly, when the Mission had ..."
- Gazetteer of the Nellore District: brought up to 1938 p83 Government Of Madras Staff, Government of Madras - 2004 "The first Telugu convert was baptized in the Penner river on September 27, 1841. The Nellore Baptist Church was organized in October 12, ... but in 1849 Mr. and Mrs. Day accompanied by the Rev. and Mrs. Lyman Jewett returned to Nellore. "
- The medical missionary ed. John Harvey Kellogg, International Health and Temperance Association - 1897 "For many years he was the central figure of the Telugu Mission; and if Samuel S. Day is called the founder, and John E. Clough the apostle, Lyman Jewett may be styled the savior of the Telugu Mission, since to his personal courage and "[page needed]
- David Downie The lone star: a history of the Telugu Mission of the American ... 1924
- John Allen Moore Baptist Mission Portraits 1994 p166 "Again in 1862 a majority favored discontinuing the Telegu work, as results were no more encouraging"
- Finette Jewett Leaves from the life of Lyman Jewett 1898 p70 "Under the guidance of a corpulent old Brahmin, the mysteries of the Telugu language were made plain,.."