After having practiced law for several years, Field became convinced that the
common law in America, and particularly in New York state, needed radical changes to unify and simplify its
procedure. 1836 was particularly devastating for Field: his first wife, youngest child, and one of his brothers all died in the same year. The Louisiana code was drafted by jurists including
Edward Livingston, Louis Lislet (1762–1832), and
Pierre Derbigny. Livingston helped to prepare criminal and civil codes for Louisiana, and Field's personal papers at
Duke University Libraries reveal that he had read Livingston's 1825 report on the
Louisiana Civil Code. He began by outlining his proposed reforms in pamphlets, professional journal articles, and legislative testimony, but met with a discouraging lack of interest. In 1846, Field's ideas gained wider notice with publication of a pamphlet, "The Reorganization of the Judiciary", which influenced that year's
New York State Constitutional Convention to report in favor of a codification of the laws. In 1847 he finally had a chance to put his ideas into official form when he was appointed head of a state commission to revise court procedure and practice. The first part of the commission's work, a portion of the code of civil procedure, was reported and enacted by the legislature in 1848. By January 1, 1850, the New York state legislature had enacted the complete Code of Civil Procedure, subsequently known as the Field Code since it was almost entirely Field's work. It also influenced later procedural reforms in England and several of her colonies (specifically, the
Judicature Acts). However, according to
Amalia Kessler, the more important aspect of Field's "code of civil procedure" was not so much the "code" part, but the "civil procedure" part. Before Field, the idea of "procedure" as a unified body of law simply did not exist in common law jurisdictions.
Joseph Story's treatises a generation earlier are a typical example, in that Story, like his contemporaries, treated "pleading" and "practice" as two clearly distinct bodies of law and never used the word "procedure". The Field Code joined together "pleading" and "practice" for the first time under the heading of "procedure" and marked the "invention of procedure as a distinct, coherent category, defined in antithesis to the substantive law". The Field Code allowed any person "having organs of sense" to testify as a witness in a court of law in New York, except "the insane and very young children". The codification, which was completed in February 1865, was adopted only in small part by the state of New York, but it served as a model upon which many statutory codes throughout the United States were constructed. it was later adopted in large part by the states of California, Idaho, Montana, North Dakota, and South Dakota, as well as the territory of Guam many years later. (Notably, Idaho largely enacted the contract sections of Field's civil code but declined to enact the tort sections.) 18 states ultimately enacted part or all of what was widely (though incorrectly) called Field's penal code, including his home state of New York in 1881. Thanks to Field's brother, Stephen (who served in the
California State Assembly and as California's fifth Chief Justice before being appointed to the U.S. Supreme Court), California bought into Field's codification project more than any other state. California first enacted a Practice Act in 1851 influenced by the Field Code, then in 1872 enacted Field's civil procedure, criminal procedure, civil, penal, and political codes as the first four
California Codes (California merged Field's penal and criminal procedure codes into a single code). Meanwhile, in 1866, Field proposed to the British
National Association for the Promotion of Social Science a revision and codification of the laws of all nations. For an international commission of lawyers he prepared
Draft Outlines of an International Code (1872), the submission of which resulted in the organization of the international
Association for the Reform and Codification of the Laws of Nations, of which he became president. ==Politics==