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Rivez was Samuel Holland's assistant under the command of the Earl of Loudoun, the British Commander in Chief in the British Colonies prior to the French & Indian War.

As noted by David Allen, 

One fruit of Loudoun’s commands was undoubtedly the lost map of New York made by Samuel Holland in 1757. This map, which was briefly mentioned in the previous chapter, was expressly “compiled pursuant to the order of the Earl of Loudon.”[48]. Although no copy of this map appears to have survived, the nature of Holland’s activities can be deduced from a list of maps of British North America, which were in Loudoun’s possession in 1757.[49] This list shows, among other things, that Holland and an assistant named Charles Rivez were engaged in copying maps of British North America. This list also includes several original maps of fortifications and communication routes made by James Montresor and other British engineers during the early years of the war.'

Several manuscript maps, which appear to have been in the possession of Loudoun, are now in the Kashnor Collection at the Huntington Library in San Marino California.  The most notable work in this important collection is “A Map of the Province of New-York & Part of New Jersey” (1757), which was signed by Charles Rivez, but probably reflects the joint work of Holland and Rivez, and very likely resembles or is a copy of the missing Holland map of 1757.   This important manuscript map is more than a synthesis older maps, and it seems to reflect some new surveying by the British Army. It includes extensive information about roads, portages, and fortifications. Beautiful and carefully drawn, it is detailed enough to show some individual houses. It is the first of a series of large-scale maps of New York made by the British in the years immediately prior to the American Revolution. It anticipates, and was probably a source for, the maps published after 1768 by Holland, Montresor, and Sauthier.