Dov Frohman
Dov Frohman is the engineer who invented EPROM, the erasable programmable read-only memory, while working at Intel around 1970, a contribution that gave the industry its first practical reusable non-volatile memory and introduced the floating-gate charge-storage principle that underlies flash memory today. His invention solved a concrete and pressing problem of the early microprocessor era — the lack of a memory that could be programmed, corrected, and reprogrammed during development — and in doing so established a technology lineage that runs directly to the non-volatile memory in modern devices. Frohman is also well known for later founding and leading Intel's operations in Israel, making him a significant figure in both memory technology and the globalization of semiconductor manufacturing.
Frohman's technical insight was to store data as charge on an electrically isolated floating gate and to recognize that such charge could be both placed and, crucially, removed. He worked out how a transistor with a gate fully surrounded by insulator could hold injected charge for years, encoding a bit that survived without power, and how exposing the device to ultraviolet light could free that charge and erase the memory. This combination — durable charge storage plus a practical erase mechanism — is what made EPROM reusable, and it is the conceptual foundation on which EEPROM and flash memory were later built by changing how the charge is placed and removed.
Frohman's EPROM mattered because it arrived exactly when the microprocessor industry needed it, turning firmware development from a slow, wasteful process into a fast iterative one. Before EPROM, storing a program in non-volatile memory meant committing to an unchangeable mask ROM or burning one-time PROMs, both painful when code was still evolving. EPROM let engineers program a chip, test it, erase it, and reprogram it repeatedly, which fit the trial-and-error reality of building early microprocessor systems. The technology became a standard tool on engineers' benches, and its timing alongside the rise of the microprocessor magnified its impact.
Beyond the specific device, Frohman's work established that charge trapped on a floating gate is a durable, practical way to store digital information without power, a principle that proved extraordinarily extensible. EEPROM kept the floating-gate idea but replaced ultraviolet erasure with electrical erasure; flash memory extended it further into the dense, electrically erasable non-volatile storage that fills modern phones, drives, and memory cards. The through-line from Frohman's EPROM to today's flash is direct, which is why his invention is regarded as foundational rather than merely one memory type among several.
Frohman's later career as the founder and leader of Intel's Israeli operations adds a second dimension to his significance, connecting him to the spread of advanced semiconductor work beyond its original centers. Establishing and running a major chip operation in Israel contributed to the growth of a significant technology industry there and to Intel's own global footprint. This part of his story is distinct from the EPROM invention but reinforces his stature as a figure whose influence extends from a specific device-level breakthrough to the broader institutional development of the semiconductor industry.
Read Dov Frohman as the inventor of reusable non-volatile memory: the Intel engineer whose floating-gate, UV-erasable EPROM solved the early microprocessor era's firmware problem and seeded the charge-storage principle behind EEPROM and flash, and who went on to help build Intel's presence in Israel.