Silicon Labs Management

Tyson Tuttle

President and Chief Executive Officer

Tyson Tuttle serves as President and Chief Executive Officer of Silicon Labs, a leading provider of silicon, software and solutions for a smarter, more connected world. Tyson joined Silicon Labs in 1997 as a design engineer working on the company’s first breakthrough product, which achieved market share leadership in PC modems and enabled the company to go public in 2000. Tyson subsequently led the marketing effort behind Silicon Labs’ first CMOS RF transceiver products for mobile handsets, spearheaded the development and market success of the company’s radio and TV tuner ICs, and served as Chief Technology Officer and Chief Operating Officer before being named CEO in 2012. Tyson has more than 25 years of semiconductor experience with industry leaders like Broadcom and Cirrus Logic / Crystal Semiconductor and holds more than 70 patents in RF and mixed-signal IC design. Tyson received the B.S. degree in Electrical Engineering in 1989 from Johns Hopkins University and the M.S. degree in Electrical Engineering in 1992 from UCLA. He currently serves on the board of the Global Semiconductor Alliance, the advisory board for the Johns Hopkins Whiting School of Engineering, and is a respected leader in the Austin community, serving on the board for KLRU-TV, home of PBS and Austin City Limits.


John Hollister

Chief Financial Officer

John Hollister serves as Chief Financial Officer and Senior Vice President of Silicon Labs, helping to lead the company’s growth in the broad-based semiconductor and Internet of Things (IoT) markets. John joined Silicon Labs in 2004 and held a variety of key financial management positions until 2007 when he became Managing Director of Silicon Labs’ Asia Operations, based in Singapore, where he was responsible for global supply chain management during a period of rapid growth overseas. In 2009, he advanced to Vice President, Manufacturing and Asia Operations. In 2012 he returned to Austin as Vice President of Business Development, where he was instrumental in executing the company's IoT acquisition strategy, and was subsequently named CFO in 2013. Prior to joining Silicon Labs, John served as Vice President of Finance at Cicada Semiconductor and held various finance positions at Cirrus Logic, Veritas DGC, 3-D Geophysical and PricewaterhouseCoopers LLP. John is a Certified Public Accountant and holds a master’s degree in professional accounting and a bachelor’s degree in business administration from The University of Texas at Austin. He serves as Chairman of the Board for the Central Texas Chapter of the American Red Cross.

Brandon Tolany

Senior Vice President, Worldwide Sales and Marketing

Brandon Tolany has global responsibility for Silicon Labs’ sales and marketing organization and distribution channels. In this role he is responsible for delivering smart, connected, energy-friendly solutions to our customers and distribution partners worldwide. Prior to joining Silicon Labs, Brandon spent the previous 12 years at Freescale Semiconductor in roles of increasing responsibility culminating as Senior Vice President, Chief Sales and Marketing Officer.  During his tenure at Freescale, Brandon progressed in a range of leadership positions including Vice President of Global Marketing for Microcontrollers and Director of Sales and Field Application Engineering for Freescale’s Americas West Region. Brandon started his career at Freescale in 2004 as a marketing manager for the i.MX applications processor product line.  Prior to joining Freescale, Brandon held various marketing and product management positions at Luminent and Mitsubishi Electric.  Brandon holds a bachelor’s degree in communications from the University of Texas at Austin.  He is a member of the board of directors for the Electronic Components Industry Association (ECIA).  Brandon also serves as a board member for The Rosedale Foundation.

Michele Grieshaber

Chief Marketing Officer

Michele Grieshaber joined Silicon Labs in April 2014 as Chief Marketing Officer, driving the company’s marketing strategies and overseeing digital and content marketing, lead generation, event marketing, media and analyst relations, social media and corporate branding. Prior to Silicon Labs, Michele was IBM’s Vice President of North America Demand Programs, responsible for delivering more than $20B in marketing-generated sales pipeline across all IBM products. A 20-year IBM veteran, Michele held strategic positions in IBM’s software, hardware, financing and services businesses including positions based in Europe and Asia. Michele holds a PhD in mechanical engineering from Virginia Tech and was a Fulbright Scholar to France. She recently served as adjunct professor of Global Business Ethics at St. Edward’s University in Austin, Texas, and is a frequent guest lecturer at The University of Texas at Austin McCombs School of Business. Michele is a member of the Board of Advisors for the College of Engineering at Virginia Tech and for the Munday School of Business at St. Edward’s University.  She is an active board member for Communities in Schools of Central Texas.

Alessandro Piovaccari

Chief Technology Officer

As Silicon Labs’ Chief Technology Officer, Dr. Alessandro Piovaccari is responsible for the company’s product and technology research and development. Alessandro joined Silicon Labs in 2003 to design the company’s single-chip FM radio products, which have surpassed 1.2 billion device shipments. He co-architected Silicon Labs’ single-chip TV tuner IC, used by nine of the world’s top ten TV makers, with more than 50 percent market share. Previously, Alessandro worked as a research scientist at Tanner Research, joining the company in 1997 to develop CMOS image sensors. From 1998 to 2003, he was a member of the design services team at Cadence Design Systems, focusing on CMOS RFICs and high-speed SerDes IP development. Alessandro holds 38 patents (30 currently issued) and is a Senior Member of IEEE and a Full Member of AES. Alessandro received Laurea and PhD degrees in electronic engineering and computer science from the University of Bologna in Italy and a Post-Master's Certificate with Honors in electrical engineering from Johns Hopkins University. He also serves as a board member for the Skillpoint Alliance and a technical program chair for the 2017 IEEE CICC.

Daniel Cooley

Senior Vice President and Chief Strategy Officer

Daniel Cooley, Senior Vice President and Chief Strategy Officer, leads Silicon Labs’ overall growth strategy, business development, new technologies and emerging markets. He has led Silicon Labs’ IoT business, most recently as SVP and General Manager, for the past four years. Under his leadership, the company has built an industry-leading portfolio of secure connectivity solutions, and the IoT business has grown to more than half of total revenue. Daniel joined Silicon Labs in 2005 as a chip design engineer developing broadcast products such as AM/FM radios and short-range wireless devices. Over the years, Daniel has served in various senior management, engineering and product management roles at the company’s Shenzhen, Singapore, Oslo and Austin sites. He has an MS in electrical engineering from Stanford University and a BS in electrical engineering from The University of Texas at Austin and holds four patents in radio and low-power technology. Daniel also serves on the board of directors for the Thinkery, a children’s museum in Austin, Texas, dedicated to science, technology, engineering and math (STEM) education.

Matt Johnson

Senior Vice President and General Manager, IoT Products

Matt Johnson serves as Senior Vice President and General Manager of Silicon Labs’ IoT products, leading the company’s IoT business. He is responsible for the development and market success of multiprotocol wireless SoCs and modules, microcontrollers, optical and environmental sensors, development tools, and wireless software stacks including Zigbee, Thread, Z-Wave, Wi-Fi, Bluetooth and proprietary protocols. Previously he served as Senior Vice President and General Manager of automotive processing products and software development at NXP Semiconductors. He joined Freescale Semiconductor in 2013 as VP and General Manager of automotive MCUs and processors. Prior to Freescale, he served as SVP and General Manager of mobile solutions at Fairchild Semiconductor. Mr. Johnson holds a BS in electrical engineering from the University of Maine and completed executive programs from Harvard Business School and Stanford University

Mark Thompson

Senior Vice President and General Manager, Infrastructure

Mark Thompson serves as Senior Vice President of Silicon Labs’ Infrastructure and Automotive products, directing the strategy for a large portfolio of products including timing, isolation, automotive radio, broadcast audio and video, PoE and other analog products. Mark joined Silicon Labs in 2000 as a product manager for the company’s silicon direct access arrangement (DAA) product family and has served in a variety of roles in multiple business units including marketing director, general manager and vice president. Prior to Silicon Labs, Mark held various engineering and marketing positions at BMC Software and Motorola's semiconductor products sector. Mark holds an MBA, an MS in electrical and computer engineering, and a BS in electrical engineering from The University of Texas at Austin, and holds four patents in microcontroller and wireless technologies. He also serves as a community board member for Caritas of Austin. 

Sandeep Kumar

Senior Vice President, Worldwide Operations

Dr. Sandeep Kumar joined Silicon Labs in 2006 and is responsible for worldwide operations, driving the company’s technology strategy and supplier choices. His operations team includes the manufacturing teams, the CAD organization, process and package engineering, product and test engineering, quality assurance, failure analysis, as well as the prototype production and reliability test labs. Prior to joining Silicon Labs, Sandeep managed global test engineering teams and was responsible for worldwide product and test engineering for the storage business at Agere Systems, Lucent technologies and AT&T Bell Labs. As a member of the Bell Labs technical staff, Sandeep also was a member of the group that designed ISDN U-interface chips, Speaker Phone Codec and Sigma-Delta A/D converters. Sandeep has a Bachelor degree in Electrical Engineering from the Indian Institute of Technology in Bombay, India, a Master of Science degree in Electrical Engineering from the University of Evansville in Indiana, and a Ph.D. in Electrical Engineering from Lehigh University. Sandeep has served on the board of the Ronald McDonald House Charities of Central Texas and currently serves on their development committee. He serves on the Electrical and Computer Engineering Department’s Industry Advisory Council for Southern Illinois University in Carbondale, Illinois.

Lori Knowlton

Chief People Officer

As Chief People Officer (CPO), Lori Knowlton is responsible for attracting and engaging high-caliber talent, developing leadership, community relations and corporate culture. Prior to joining Silicon Labs, Lori served as CPO for where she led the company’s people agenda from early-stage growth through an IPO and ultimately through an acquisition by Expedia. During her nearly ten years at HomeAway, Lori grew the team exponentially and created scale through processes, systems and high employee engagement. Previously, Lori served in a variety of human resources leadership roles at leading high-technology companies including Progress Software and its operating company Sonic Software, Interliant Inc., C-bridge Internet Solutions and the Monitor Company. Lori is a mentor at TechStars Austin and serves on the strategic planning committee of the Magellan International School, an Austin-based Spanish immersion IB school. She is a frequent and accomplished public speaker, having presented at numerous conferences including National Association of Corporate Directors (NACD) Spring Forum, NACD Summit, the Texas Conference for Women and Connected Women in Technology. Lori holds a BA in English literature (magna cum laude) from Bowdoin College in Brunswick, Maine.

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