Halstead was born on June 18, 1945, in Manchester, England. He studied music at Chetham's School in Manchester, and later at the Royal Manchester School of Music. His chosen instrument initially was the piano, though he also studied horn and organ, as well as composition. He eventually turned his focus to the horn, but without abandoning his keyboard activities -- he later studied the harpsichord with George Malcolm. He also took lessons in conducting with Charles Mackerras.
Halstead was appointed principal horn player for the BBC Scottish Symphony Orchestra in 1966, and soon advanced to other more prestigious first-chair posts, including in the London Symphony Orchestra. After further study on the horn in the early '70s with Horace Fitzpatrick, he developed greater interest in hand horns and soon landed principal horn posts in several period-instrument ensembles, including the English Chamber Orchestra, Academy of Ancient Music, the Hanover Band, and the Orchestra of the Age of Enlightenment.
In 1976 Halstead debuted as conductor leading the premiere of a modern work, Elisabeth Lutyens' One and the Same. Soon he began regularly conducting several important period ensembles, most particularly the Hanover Band. In the latter 20th and early years of the 21st centuries, Halstead, while remaining active as a horn player, steadily developed his career as one of the foremost English conductors of period-instrument music.
In 1995 Halstead launched a most ambitious project with the Hanover Band, the complete orchestral works of J.C. Bach, which would include the harpsichord and fortepiano concertos, with Halstead directing from the keyboard. He finished this 22-CD set for CPO in the early 2000s, with the last release issued in 2006., Rovi