Rick Darter

Co-founder and CEO

Rick Darter co-founded RAVE Computer Association in 1988. With more than 40 years of leadership experience in the computer industry, Mr. Darter drives the strategic direction of RAVE Computer and has been instrumental in creating business and marketing plans that result in the diversity required to maintain continued profitability and advancement.

Mr. Darter currently serves on the Board of Directors for several non-profit organizations, including as the President of the  National Defense Industry Association (NDIA) Michigan Chapter and Automation Alley, a technology business association that strives to advance the economic growth and image of Southeastern Michigan Mr. Darter is a founding member as well as a Board Member of the RAVE CAVE at DC3S, a 3-D immersive center for automated virtual environments that promotes Modeling, Simulation and Visualization in Education and Industry. Mr. Darter serves as a Director on the National Modeling and Simulation Coalition based in Virginia. He also sits on the Board of DANAS Technologies, a for-profit Veteran owned, minority owned, woman-owned re-seller of computer hardware.

Within the Modeling, Simulation and Visualization (MSV) community, Mr. Darter is an active force, both in Michigan and nationally, in furthering the initiative to recognize MSV as an industry, including the educational disciplines that support it.


Sara Blackmer


Sara’s leadership touches every department at RAVE, ensuring quality, communication, and continuity. Her past experience in business strategy development and execution in defense and other federal markets prove invaluable to the growth of RAVE.

Previously in her career, she was the Director of Government Markets for Pratt & Miller Engineering, Director of Defense Development for the Michigan Economic Development Corporation, and an Associate for Booz Allen Hamilton.

Sara was awarded the Horizon Industry Award for Business Development from the Women in Defense Michigan Chapter. She served on the Executive Board of Directors for the Robotics Technology Consortium (RTC) from 2012-2014, and helped to convert the RTC to the National Advanced Mobility Consortium (NAMC). She currently serves on the University of Michigan M-TRAC Transportation Executive Board and Oakland University’s School of Engineering and Computer Science Executive Board of Advisors.

Sara has served 16 years in the United States Air Force as an Aircraft Maintenance Officer, and currently serves in the United States Air Force Reserves at the Officer Training School in Maxwell Air Force Base, Alabama. Sara is also certified in defense acquisition logistics and test and evaluation through the Defense Acquisition University. She has earned a BSE Cum Laude in Naval Architecture and Marine Engineering from the University of Michigan, an MBA and an MS in Global Supply Chain Management from Indiana University, and earned her Project Management Professional Certification in 2009.

Sara is married and a mother of three children. In her very limited free time, she enjoys to read.


Doris Block-Tomlinson

Vice President of Contracts and Corporate Relations

Doris Block-Tomlinson is CEO and President of Danas Technology, a value added reseller of computer hardware and a system integrator of custom computing solutions targeting the military and manufacturing markets. Doris also consults for RAVE Computer as Vice President of Contracts and Corporate Relations. In this role, she handles all contract and subcontract negotiations and ensures that Rave is strategically aligned with OEM technology partners. Doris joined RAVE Computer in 2002 as the Director of Marketing and eventually moved to the Vice President of Marketing, where she had overall responsibility for the corporation’s strategic marketing, corporate communications policies, executive communications, corporate identity programs and public relations. Additionally, she led the advertising and brand strategy for the organization. Prior to RAVE, Doris served as the U.S. Americas Marketing Manager for Sun Microsystems. In this capacity, Doris handled corporate events for the Americas including tradeshows, and various internal and external communication functions.

Karl Rosenberger

Director of Product Development

From dog lover to electronic circuit and software program designer, Karl Rosenberger with 30 years of computer industry experience is known for figuring out the cause and solution to technical issues that escape the other guy. He gets to the root of a client’s need by designing RAVE optimized computers for nearly any task and tackling thermal issues, acoustics/noise, unique form factor needs and other problems customers face on a daily basis. In 2009, Mr. Rosenberger led the RAVE Computer team in building a short-depth, quiet 2U image generator that won the Intel 2010 “Most Innovative Reseller Partner of the Year” in the Server/Workstation category. In his spare time, Karl enjoys playing and recording music as well as spending time with his wife Anita as they care for their fostered Siberian Huskies.


Mark Witulski

Director of Manufacturing

Known for his superior ability to remember all types of computer systems, troubleshoot and diagnose incompatibilities; Mark Witulski is RAVE’s manufacturing director building high-quality systems and never sacrificing quality of work to take the easy route. With more than 19 years of computer manufacturing experience, Mr. Witulski works as a team with other RAVE departments to consistently deliver quality systems and the best possible solution to each customer. Mr. Witulski graduated Magna Cum Laude from Walsh College and earned degrees in business management and computer information systems.