Can the seat foam be replaced on a worn executive chair?

In principle yes, but it's not always practical. Replacing seat foam on an executive chair requires disassembling the seat pan from the mechanism, removing the upholstery (which may be stapled or glued), cutting new foam to shape, and reattaching the upholstery. For chairs with stapled upholstery, this is a manageable DIY project for someone handy. For glued or sewn upholstery, it typically requires an upholstery professional. The cost of professional foam replacement (labor plus materials) often approaches or exceeds the cost of a mid-range replacement chair. Foam replacement makes sense for premium leather chairs with excellent structure — for mid-range chairs, replacement is usually the better value. FindOfficeFurniture.com — call 888-719-4960 for replacement pricing.