We're purpose-driven individuals, determined to push the boundaries of timing innovation and inspire the future of electronics. Meet the people at SiTime who do this every single day.

Rajesh Vashist


Rajesh’s passion is to build great companies. SiTime is his fourth startup and his second time serving as CEO. He joined SiTime in 2007, a year before the financial crisis started and venture funding became scarce. As CEO, he led the company through the Great Recession and oversaw the company’s growth from a pre-revenue startup into a successful public company. The company’s acquisition by MegaChips (Tokyo Stock Exchange: 6875) was the largest acquisition in 2014 of a venture-backed semiconductor company, with a 10 times revenue valuation. At SiTime, Rajesh has built a culture of innovation where employees routinely create exceptional products while feeling challenged, empowered, and rewarded.

From 1999 to 2006, Rajesh was the CEO and Chairman of the Board of Ikanos Communications where he drove the organization from a pre-revenue startup into a successful public company. Prior to Ikanos, Rajesh served as a General Manager at the storage company Adaptec (acquired by Microsemi) and held various general management and marketing positions at Rightworks, an ERP software company; Vitelic Semiconductor; and Samsung Semiconductor. Rajesh holds a BS degree in engineering from REC/NIT Rourkela in India and an MBA from Marquette University.

Markus Lutz

Founder and Chief Technology Officer

Markus co-founded SiTime in 2005 and, within two years, released the world’s first MEMS oscillator into mass production. Markus is a MEMS expert, a prolific entrepreneur and inventor. He holds over 100 patents, including patents underlying MEMS First™ and EpiSeal™, the processes used to manufacture SiTime silicon MEMS resonators and make them extremely small, durable, and reliable, with quality that is 50 times better than quartz resonators.

Markus’s success in MEMS began at Robert Bosch GmbH, where he invented the world’s first mass-produced MEMS gyroscope. This technology is fundamental to modern vehicle stability and is considered Bosch’s most successful component project. Markus was a visiting scholar at Stanford University for five years, is a frequent speaker at major MEMS conferences, and recurrent contributor to technical journals. He received his Diplom Ingenieur Elektrotechnik at the Technical University of Munich. More on Markus

Lionel Bonnot

Executive Vice President, Business Development

Lionel joined SiTime in 2018 to accelerate growth across the company’s broad market. He brings a wide range of experience to SiTime. Over his 25 years career, Lionel has managed sales, business development, marketing and engineering teams. At SiTime, he draws on his cross-functional knowledge to lead the company’s global business development strategy and foster relationships within the industry to drive revenue.

Prior to SiTime, Lionel was the senior vice president of business development at Quantenna Communications. Over his 10 years at the company, he drove growth, helping pave the way for Quantenna’s successful transition from a pre-revenue startup into a successful public company. Prior to Quantenna, Lionel held senior sales positions at Ikanos Communications, a semiconductor company in the telecommunications and networking space. Lionel received his Master’s degree in Computer Science from ESI (École Supérieure d'Informatique). More on Lionel

Vinod Menon

Executive Vice President, Engineering

Vinod oversees SiTime’s amazing engineering teams. His MEMS, analog mixed-signal, and systems teams all reside under the same roof—a development model that fosters successful collaboration and is unique within the timing industry. Since joining SiTime in 2012, Vinod has overseen the delivery of TempFlat MEMS™, a revolutionary breakthrough that reduces the need for temperature compensation, resulting in dramatically higher performance, smaller size, and lower power. He also orchestrated the development of the Elite Platform™. This family of products uses DualMEMS™, a new architecture that enables 30 times better performance in the face of environmental stressors.

Prior to SiTime, Vinod held VP and leadership positions at LSI Corp. (acquired by Broadcom, formerly Avago), National Semiconductor (acquired by Texas Instruments), and Advanced Micro Devices where he led the development efforts for high-value products. Vinod holds a B.Tech. degree in Electrical Engineering from IIT Bombay in India and an M.S. in Electrical & Computer Engineering from the University of California, Santa Barbara. More on Vinod

Piyush Sevalia

Executive Vice President, Marketing

Piyush joined SiTime in 2008 to pursue the vision of transforming the $6 billion timing industry. At SiTime, Piyush and his team are responsible for helping SiTime create and launch the industry’s best timing products, ensuring that customers have an exceptional experience with SiTime, managing the product lifecycle as well as all aspects of marketing communications and industry analyst relations. Since 2008, Piyush has helped grow SiTime from a pre-revenue startup to a fast-growing leader with over 90% share of MEMS timing.

Previously, Piyush was the VP of Marketing at Ikanos Communications where he was a key member of the team that drove Ikanos to success and a public offering. He launched his career at Cypress Semiconductor in applications engineering and marketing, where he defined and launched several category-leading products that generated hundreds of millions of dollars in revenue. Piyush earned Bachelor’s and Master’s degrees in Electrical Engineering from the University of Bombay and the University of Michigan respectively, and an MBA from the University of California, Berkeley. More on Piyush

Samsheer Ahmad

Corporate Controller and Vice President, Finance

Samsheer is an avid believer in technology, analytics, and understanding the drivers of business. He joined the company in 2015 during a time of rapid growth and has used his experience in leading ERP implementations to set up the processes, enterprise systems, and infrastructure at SiTime to scale the company. Samsheer has built a team of finance experts at SiTime to oversee the company’s fast revenue growth and successfully manage the budget to plan and profitability.

Samsheer has more than 15 years of operational and technical accounting experience at global technology companies with significant operating scale and complexity. Previous to SiTime, he held senior positions at Maxim Integrated Products, SiRF Technology, TiVo, and Guavus. Samsheer is a Certified Public Accountant and holds a bachelor’s degree in Accounting and Information Systems from the University of the South Pacific. More on Samsheer

Paul Hagelin

Vice President, MEMS Engineering

Paul is passionate about entrepreneurship and innovation. He joined SiTime in 2005 to direct the development and fabrication of SiTime’s microelectromechanical systems (MEMS) resonator devices. Under Paul’s leadership, SiTime delivered the industry’s first production MEMS used in timing and launched revolutionary technologies such as TempFlat™ MEMS, which delivers best-in-class performance, size and reliability for mobile, Internet of Things (IoT) and wearables.

Prior to joining SiTime, Paul co-founded C Speed Corporation in 1998, where he led the development of MEMS micromirrors for optical switching. He holds a Bachelor of Science degree in Engineering from Harvey Mudd College, a Master’s of Science degree in Mechatronics and Optical Engineering from Loughborough University, and a Ph.D. in Electrical Engineering from U.C. Davis. He holds over 30 patents in the fields of micromachining and optical systems.

Aaron Partridge

Founder and Chief Scientist

Aaron co-founded SiTime in 2005 when his team developed a solution for MEMS timing that had eluded others for decades and would lead to the successful commercialization of MEMS oscillators. As Chief Scientist and an expert in MEMS, analog electronics, and precision timing, Aaron is responsible for guiding the long-term technological direction of the company and acting as the technology bridge between MEMS resonators and analog oscillator ICs. He holds over 75 patents, including patents at the core of SiTime MEMS resonators and oscillator circuits.

Before SiTime, Aaron was the MEMS resonator research project manager at Robert Bosch Research and Technology Center. Before Bosch, he co-founded and was Chief Scientist at Atomis, Inc., a tunneling and atomic force microscope company that was acquired by Surface Interface, Inc. Aaron has authored over 40 scientific papers and served as chair for several IEEE committees. Aaron received B.S., M.S., and Ph.D. degrees in Electrical Engineering from Stanford University. More on Aaron