Our team consists of industry’s most innovative technologists and seasoned executives in the business of optoelectronic component design, manufacture, packaging and applications. We have a strong customer focus, and are dedicated to providing products with the highest levels of performance, consistency and reliability. We are committed to doing business with both customers and vendors with the highest levels of integrity and fairness.

Matthew Dummer, VCSEL Research

ManagerOptoelectronic Device Design

Matthew Dummer
VCSEL Design

Dr. Dummer is responsible for the design of unique optoelectronic devices forming the basis of Vixar products. He has 10 years of experience in the design, fabrication, test, packaging and integration of high speed optoelectronic devices. As part of his thesis research at the University of Santa Barbara he demonstrated high functionality photonic integrated circuits (PICs) for photocurrent-driven wavelength conversion and monolithically integrated tunable transceivers operating up to 40 Gb/s. He is the author or co-author of over 20 publications and conference presentations. Dr. Dummer received his M.S. and Ph.D. in Electrical Engineering from the University of California at Santa Barbara, and his B.S. in Electrical Engineering from the University of Minnesota.

Mary Hibbs-Brenner, CEO

Founder Chief Executive Officer

Mary Hibbs-Brenner
Co-founder and CEO

Dr. Hibbs-Brenner brings 30 years of proven expertise guiding innovative semiconductor and optical technologies into the commercial market.

Prior to co-founding Vixar, Dr. Hibbs-Brenner held business development, technical management, and research positions at Honeywell. She was responsible for initiating the company’s VCSEL business, and held the position of Director of Research and Development within that business.

The Honeywell VCSEL business experienced rapid growth. VCSEL products from Honeywell and others helped to fuel the growth of the Internet by becoming the laser source of choice for Local Area Networks (LANs) and Storage Area Networks (SANs). This business was sold to Finisar in 2004. Dr. Hibbs-Brenner also served as a business development lead within the Honeywell Technology organization, developing business plans for bringing new technologies to market.

Dr. Hibbs-Brenner has an MBA from the Carlson School of Business, University of Minnesota, a Ph.D. in Materials Science from Stanford University, and a B. A. in Physics from Carleton College. She spent two years doing post-doctoral research at the University of Linkoping, Linkoping, Sweden.

Dr. Hibbs-Brenner has seven patents, and over 50 publications and invited presentations.

William Hogan, Product Development

ManagerProduct Development

William Hogan
Product Development

Mr. Hogan oversees all of the product and package development for Vixar products. He has 30 years of experience working in electro-optics, including fiber optic communications and optical disk technology at IBM, JDSU, Rohm and Haas, Nuvotronics, and Vixar. He brings to the product development effort both depth and breadth of expertise spanning optoelectronic packaging, reliability evaluation, and system integration of optoelectronic components, integrated circuits, electrical, optical and mechanical design. He has been granted 44 patents and is the co-author of numerous technical papers and conference presentations. Mr. Hogan has an M.S. in Optical Engineering from the University of Arizona, an M.S. in Electrical Engineering from the University of Minnesota, and a B.S. in Electrical Engineering from Michigan State University.

Klein L. Johnson, CTO

Founder Chief Technology Officer

Klein L. Johnson
Co-founder and Chief Technology Office

Dr. Johnson is a co-founder of Vixar. He brings a rich background of technical and engineering leadership in optoelectronic chip design and development. His 12 year career at Honeywell as a research scientist and project leader spanned a broad range of research and development optoelectronic device and packaging efforts, high speed VCSEL chip and package design, including the development of polymer and glass waveguides, a very high bandwidth array transceiver, optoelectronic integrated circuits, and rugged packaging for military applications. Dr. Johnson has a Ph.D. in Electrical Engineering from the University of Minnesota and a B. A. in Mathematics and Physics from St. Olaf College. Dr. Johnson has 3 patents, 7 patent applications, and is the author/co-author of multiple papers and conference presentations.

Travis Murphy, Finance

Travis is a seasoned financial executive with 30 years of experience in senior financial management and leadership roles with start-up and fast paced emerging growth technology businesses. He has extensive experience in private and public equity, and debt financing, is experienced on both the sale and buy side of acquisitions, and has established planning, budgeting and financial reporting systems for start-up companies.

Travis’s past experience includes Price Waterhouse and ADC Telecommunications, but more recently has served as CFO for numerous small companies including Diametrics Medical, Inc. and GeoDigm Corporation. He has a B.S in Accounting from the University of Illinois, and an M.B.A from the University of Minnesota.

Todd Schieffert, Business Development

Business Development

Todd Schieffert
Business Development

Todd Schieffert is a highly accomplished technology and communication executive with over 30 years of experience in general management, sales, business development, marketing and product management. Todd has demonstrated success in managing companies and organizations, creating vision, developing domestic and international strategic business plans, launching new product programs, building strategic relationships, securing revenue, and driving corporate value. Todd has successfully raised capital to start new companies and new product portfolios.

Todd’s most recent position was Senior Vice President of McWane Inc. where he focused on technology evolution, new markets and new products for the public safety and mobile wireless market segments. Prior to McWane, Todd was President of Comtech International, a mobile wireless repeater and distributed antenna systems company. Todd’s past experience includes President of Broadband Wireless Access Consulting and at ADC Telecommunications where he held numerous executive leadership positions in Sales, Marketing, Business Development and Product Management. As an active leader in the Wireless Group, Todd created market solutions for 802.11 Wi-Fi, IP Wireless Gigabit Transport (E-Band), 802.16e 4G WiMAX and LTE. Todd holds a bachelor’s of science degree in business from Saint John’s University.

Rollie Sollenberger, Operations


Rollie Sollenberger

Rollie Sollenberger is responsible for the Company’s supply chain and fulfillment. He brings 30 years of electronics experience in a variety of leadership positions in operations, engineering, quality, and business development disciplines. Preceding Vixar, Rollie served as Vice President of Operations for HSIO Technologies, a privately-held developer of high-performance interconnect solutions for semiconductor device manufacturers and for their customers in the computing and mobile device segments. Rollie’s prior work also includes experience at ADC Telecommunications, Honeywell International, and National Semiconductor on technologies ranging from radiation-hardened integrated circuits to distributed antenna systems to Internet Protocol enabled hybrid fiber/coax telephony solutions. Rollie holds an M.S. in Engineering Management from the University of Massachusetts, and a B.S. in Electrical Engineering from Iowa State University.

Charles Steidl, Quality and Reliability

ManagerQuality and Reliability

Charles Steidl
Quality and Reliability

Mr. Steidl is responsible for ensuring that the product shipped by Vixar meets our customer quality and reliability requirements. He has 10 years of experience at Boston Scientific in integrated circuit test development and validation for Class III medical devices. While at Boston Scientific he was a statistical subject matter expert who mentored other engineers in the use of statistical tools such as Measurement System Analysis (MSA) to promote data driven decision making and improved quality. In particular, he developed a failure analysis and process monitor program that earned him a Boston Scientific Quality Excellence Award. Mr. Steidl has M.S. and B.S. degrees in Electrical Engineering from the University of Minnesota.