Silicon Labs Management

Tyson Tuttle

President and Chief Executive Officer

Tyson Tuttle serves as the President and Chief Executive Officer of Silicon Labs, a leading provider of silicon, software and solutions for a smarter, more connected world. Since joining Silicon Labs in 1997, Tyson has shaped the company’s strategic and technological direction. He helped design the company’s first breakthrough IC product, which achieved market share leadership in PC modems and enabled the company to go public in 2000. Tyson led the marketing effort behind Silicon Labs’ first RF transceiver products for mobile handsets and spearheaded the development and market success of the company’s radio and TV tuner ICs. Tyson also led Silicon Labs’ broadcast product lines until 2010 when the R&D team was consolidated under his leadership as Chief Technology Officer. He became Chief Operating Officer in 2011, managing Silicon Labs’ business units and R&D, and was promoted to CEO in 2012. In his C-level roles, Tyson spearheaded the company’s focus on the Internet of Things, and has driven six strategic IoT acquisitions since taking the position of CEO. Tyson has more than 25 years of semiconductor experience with industry leaders like Broadcom and Cirrus Logic/Crystal Semiconductor, holds 70 patents in RF and mixed-signal IC design. Tyson holds a BS in electrical engineering from Johns Hopkins University and an MS in electrical engineering from UCLA. He serves on the board of the Global Semiconductor Alliance and is a respected leader in the Austin community, serving as Chairman of the Board for KLRU-TV, home of PBS and Austin City Limits.


John Hollister

Chief Financial Officer

John Hollister has served as Silicon Labs’ Chief Financial Officer and Senior Vice President since 2013, 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. 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 also serves as board chair elect for the Central Texas Chapter of the American Red Cross.

Brandon Tolany

Senior Vice President, Worldwide Sales

Brandon Tolany has global responsibility for Silicon Labs’ sales 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 $B 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 General Manager, Internet of Things Products

Daniel Cooley, Senior Vice President and general manager of Silicon Labs’ Internet of Things (IoT) products, drives the company’s global IoT strategy and business results. He is responsible for the development and market success of the company’s microcontrollers, multiprotocol wireless SoCs, wireless modules, wireless MCUs and transceivers, optical and environmental sensors, IoT development tools and wireless protocol stacks including Thread, ZigBee, Bluetooth and proprietary sub-GHz software. 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.

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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