Mark Johnson Email & Phone Number

Solve the "really hard" (considered impossible) technical problems

Timestore Security, Inc. provides specialized solutions for DoD and federal agencies.

Research and Development for federal contracts. Job function require an in-depth background in hardware and system software internals, forensic investigation, reverse engineering, digital security defense, and sophisticated security exploits. A TS/SCI clearance w/Polygraph is required.

Menlo Park, Ca, Us

My division contracted research with Federal agencies. I worked at SRI's Advanced Cyber Labratory in the WDC area, reporting to the Director of Operations. My job required an independent thinker and worker who can create innovative approaches to problems, with detailed knowledge in all areas of system security, including being able to create expert exploits and defenses. It also required kerrnel and user mode software design, intimate knowledge of Windows, Linux, and Android Internals, also an in-depth hardware architectural and design understanding of computers and devices. A TS/SCI security clearance w/SSBI and poly was required.

I consulted with leading technology companies in the US and Canada to help them design and develop optimal hardware/software solutions to address ongoing technology requirements. Designs included SSD firmware and drivers (3 clients), Wireless USB firmware, embedded RKVM USB firmware and utilities, and HD Video ASIC 290*290 channel crossbar switch functional test and signal analyzer.

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Access Data specialized in Digital Computer Forensics software. Their primary product has been the Forensic Tool Kit (FTK), used for analyzing Dead-Box computer systems, including finding deleted, hidden, and encrypted evidence on computer hard drives, etc. I helped AD design a stealth agent for enterprise deployment, with many of these capabilities provided on live systems, used to protect corporate intellectual property, etc. Most of my designs ran at kernel level, providing new capabilities.

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Reverse Engineering PC BIOS, Firmware and Software Exploits. A Secret security clearance was required.

Huntsville, Al, Us

I designed a configuration and firmware update utility for Avocent's RKVM product customized to plug into Intel servers, which ran on the servers under Windows, WinPE, Linux, and DOS. I also ended up providing a custom USB driver and modules for uCLinux on the RKVM board, which had an Intel Xscale ARM-compatible processor.

Santa Clara, California, Us

I designed and wrote software for SOHO Internet appliances, using the VxWorks Operating System. I also wrote software and firmware for Server Mainboard and HotSwap SCSI backplanes. Target Processors were x86 and 8051. I wrote code in assembler and "C".

Redmond, Washington, Us

Designed Netware Device drivers in 32-bit "C" and Assembler.Left due to imminent company demise.

Provo, Ut, Us

Responsibilities: Driver Developer, Netware Kernel group,also developer liason for developers at Dell, Compaq, NCR, and other major Netware Server suppliers. I also wrote the Device Driver Specification (manual) for 3rd party driver developers, along with other Specifications). I also redesiged the SCSI adapter to provide disconnect capability, along with optimized firmware.

I was the primary architect for Hardware, Firmware, and software products, as well as managing all aspects of operation. We designed a real-time OS (Reflex), also a distributed database supporting Remote Procedure Calls. This was implemented on a LAN running HDLC (see GA), and allowed fault-tolerant clustered designs (1979). I designed a series of embedded adapters, even venturing successfully into Bit-Slice micro-programming, making a SMD disk adapter supporting 4 drives. In total I designed some 40 adapters and cards, and produced a limited number of DX1600 desktop systems in 1981 for a large customer. I closed the company down in 1988 due to lack of capitol and cash flow to make the transition to PC architectures.

This endeavor began with me as an independent consultant, but because of customer demand, evolved into designing and manufacturing computer host adapters bus-compatible with the GA-16 series minicomputers, along with requisite drivers and diagnostics.Note: This company pre-dated another later un-related entity, also named Datamark Systems. I eventually formed a the Datamark Information Systems, Inc. corporation.

Development manager for 12 developers, also wrote drivers and diagnostics for the B800 Minicomputer.All programming was in Assembler.

I was responsible for designing, approving, and overseeing all new network solutions designed by GA (I had previously designed for GA networks for Bank of America, Security Pacific Bank, Home Federal S&L, Citizens S&L, etc.) My design for BofA included designing the worlds first commercial LAN, running over STP, with CSMA/CD and both hdwr collision detection and avoidance - 1975). It ran HDLC w/bus-master DMA. This pre-dated both ETHERNET and ARCNET, and was also much faster than either design when they later arrived. I also helped design the extended instruction set for the new GA-16 processor series.

I was the primary communications/network driver designer for GA, also creating a new layered driver architecture. I wrote drivers for all serial communications devices, both special and standard products. This included IBM I/O channel control unit/device emulators used with front-end applications. I also designed OS features and interfaces for the Control OS, and wrote diagnostics for most communications devices. All programming was in GA16 Assembler.

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I functioned as team-lead maintaining company software products (OS, Compilers, Linkers, Debuggers, etc.). I also designed a stand-alone linking loader, ported the Tape Operating System to a Disk Operating System, and created the Boot-ROM code for all bootable devices for the new Tempo-II computer. All programming was in Assembler.