William Leader Maberly was born in Surrey in 1798.
He joined the army as a Lieutenant in 1815, and also pursued a role in politics, acting as MP for Westbury, Northampton, Shaftesbury and Chatham from 1819 to 1834. Maberly rose to public prominence as a civil servant, a career that started in the role of Surveyor General in 1831, he then became Clerk of the Ordnance in 1833 and then Commissioner of Customs in 1834. In 1836 Maberly became Secretary at the Post Office and subsequently began a fractious relationship with Sir Rowland Hill as Hill fought for postal reform.
Maberly oversaw the introduction of the uniform penny post in 1840, and by 1856 Hill had replaced Maberly as the senior civil servant in the Post Office. Maberly was transferred to the Board of Audit where he served until 1866.
Maberly died in London in 1885.