Executive management

Vlad Shmunis, Chief Executive Officer, Founder, and Chairman of the Board


Vlad Shmunis founded RingCentral with the idea of using the power of cloud technologies to reimagine business communications. By unifying message, video, phone and contact center on a single platform, RingCentral empowers today’s mobile and distributed workforces to communicate, collaborate, and connect via any mode, any device, and any location. Under Shmunis, RingCentral has evolved from a startup company, funded in 2006 with a $12 million series A round led by Sequoia and Khosla Ventures, to a publicly traded NYSE listed company with a market cap of more than $15 billion.

Shmunis has received numerous leadership accolades, including being named as one of the Top 10 CEOs of a large company, a Best CEO for Diversity, and Best CEO for Women in the 2021 Comparably Awards. He was also named a Best CEO in the 2020 Comparably Awards. Additionally, Shmunis has been named Best CEO in Institutional Investor’s 2021 and 2020 All-America Executive Team. He received the 2020 Unified Communications Leader of the Year award from UC Today, the leading publication for unified communications. Previously, he was named a finalist for the EY Entrepreneur Of The Year™ Award in the Northern California region in 2014 and 2011. Shmunis is also a recipient laureate of Ellis Island Honors Society Award 2021.

RingCentral is recognized as the largest and fastest-growing global pure-cloud communications solutions provider. RingCentral is the top-ranked company in the 2021 Omdia North American UCaaS Leadership Scorecard for four years in a row and is a leader in Frost & Sullivan's 2021 UCaaS Radar Reports for North America for the ninth year in a row. In addition, RingCentral has been named a Leader in the Gartner Magic Quadrant Unified Communications as a Service, Worldwide, in 2015, 2016, 2017, 2018, 2019, 2020, and 2021, and in 2021 received Frost & Sullivan's Leadership Award for excellence in developing effective strategic partnerships in the UCaaS industry.

Prior to launching RingCentral, Shmunis served as the founder and CEO of Ring Zero Systems, where he pioneered desktop business communications software. Ring Zero shipped more than 25 million copies of its software via its partnerships with leading PC manufacturers, including IBM, HP, Sony, Toshiba, and many others. Ring Zero was acquired by Motorola.

Shmunis supports a number of charitable initiatives, including Cancer Research at Stanford University, San Mateo County General Hospital, School of Biomedicine and Cancer Research, as well as the Institute of Anthropology, and various archaeological initiatives at Tel Aviv University.

Shmunis holds a Bachelor's, Magna Cum Laude, and Master's degree in Computer Science from San Francisco State University and is a named inventor on a variety of US patents.

Vaibhav Agarwal, Interim Chief Financial Officer


Vaibhav Agarwal joined RingCentral in 2016 as Vice President, Corporate Controller, where he was responsible for accounting and compliance operations. He was promoted to Chief Accounting Officer in 2018 with added responsibilities of tax and treasury. In January 2022, he was appointed RingCentral’s Interim Chief Financial Officer, where he is responsible for all finance functions, including financial planning, controllership, tax, treasury, and investor relations.

Agarwal is an accomplished finance executive and brings over 20 years of corporate and operational finance experience across the technology industry. In his six years at RingCentral, Agarwal has played a key role in driving the operating financial strategy of RingCentral that enabled rapid growth from $300 million to over $1.5 billion in annual recurring revenue. Agarwal was central in driving the financial aspects of RingCentral’s growth initiatives such as strategic partnerships, M&A and Go-to-Market enablement. He led and executed on multiple capital transactions such as convertible debt financing and share repurchase program. He has been deeply involved with technology and operations transformation to guide RingCentral in its journey to becoming a multi-billion dollar cloud communications company. Agarwal also established key governance and controls mechanisms, resulting in a consistent public company execution model.

Prior to RingCentral, Agarwal has held senior financial positions at PricewaterhouseCoopers, Intel, Altera and Intuitive Surgical. Agarwal is a CPA, a Chartered Accountant, and he has an undergraduate degree in accounting and finance from the University of Delhi, India.

Kira Makagon, Chief Innovation Officer


An 11 year veteran of RingCentral, Kira Makagon serves as Chief Innovation Officer where she leads global product, user experience, engineering, cloud operations, security, and IT. She has been a critical driver in defining RingCentral’s product strategy and global reach that has put RingCentral at the forefront of the communications and collaboration market, leading to rapid year-over-year growth from pre-IPO to over $1.5 billion in annual recurring revenue. 

From 2012 on, Makagon led a number of market-first product innovations at global scale, such as RingCentral's mobile-first cloud PBX with integrated video meetings capabilities. She launched RingCentral's open platform, allowing for customizable workflows through open APIs. 

In 2015, Makagon led the acquisition of Glip, a team messaging solution, making RingCentral the first cloud communications provider to have a truly unified solution across messaging, video, and phone. Under her leadership, RingCentral brought omnichannel capabilities into its collaborative contact center solution with the acquisitions of ConnectFirst and Dimelo, enhancing the customer experience for businesses worldwide. 

In 2020, Makagon spearheaded the launch of RingCentral Video®, the company's proprietary video meetings solution. 

In 2021, she focused on launching RingCentral Ventures™, RingCentral's corporate ventures arm, which partners with exceptional founding teams and leading venture capitalists to reimagine the future of work through communications and collaboration. With RingCentral Ventures well on its way, Makagon expanded her responsibilities and resumed her leadership of the innovation organization. 

Makagon has received numerous awards, including a 2021 Aragon Research Women in Technology Award; a 2020 Silver Stevie for Most Innovative Woman of the Year – Technology; a 2019 Gold Women World Award for Excellence in Industry Woman of the Year: Cloud Computing/SaaS/Internet; a 2018 San Francisco Business Times Forever Influential Honor Roll award; a 2016 Silver Stevie for Female Executive of the Year; a 2016 Most Influential Women in Business from the San Francisco Business Times; a 2015 Women of Influence from the Silicon Valley Business Journal; and a 2015 Golden Bridge Business and Innovation award.

Throughout her career, Makagon has pioneered multiple transformational technologies and companies, and served as an advisor to entrepreneurs and early stage companies. Before joining RingCentral, Makagon founded and served as CEO and president of Red Aril, a real-time audience and media optimization platform, acquired by Hearst Corporation. Prior to that, she co-founded and held executive and board positions at flagship online marketing and CRM companies, including Octane Software, acquired by E.piphany, and Scopus Technology, acquired by Siebel.

Makagon is a regular lecturer at UC Berkeley and participant in industry panels and podcasts. She holds a bachelor's degree in computer science from the University of California, Berkeley, and an MBA from the Haas School of Business at UC Berkeley. She also serves as a member of the Board of Directors at Calix and American Technion Society.

Carson Hostetter, Chief Revenue Officer


As RingCentral’s Chief Revenue Officer, Carson Hostetter leads global sales including all direct, channel, and strategic partners. Under his watch the team has continued to grow and thrive with a strong partner ecosystem, continued enterprise growth, accelerated momentum with small and medium business; and increased customer retention. He also plays a key role leading strategic partnerships.

Prior to being promoted to the Chief Revenue Officer role, Hostetter held the title of Senior Vice President of Worldwide Field Sales. In this position, he led RingCentral’s worldwide field teams including field sales for the enterprise and commercial segments, solutions engineering, contact center sales, and video collaboration sales. Hostetter built a world-class enterprise business taking the business from $5 million to $500 million in five years.

Prior to joining RingCentral in 2016, Hostetter worked at Avaya for seven years, holding several VP-level sales positions with revenue responsibilities up to $1B annually. He moved to Avaya after 10 years at Nortel Networks.

As an industry veteran, Hostetter has seen it all in the unified communications and contact center space and is passionate about using that knowledge to help customers transition to the cloud.

Hostetter holds a bachelor's degree in material science and engineering from North Carolina State University. He resides in Atlanta, GA, home of one the world’s busiest airports, which he often uses to visit customers, partners, and team members around the world.

Hostetter has been happily married for over 10 years to Julie and has two daughters. He holds a third-degree black belt and sensei title in Shuri Ryu karate and enjoys teaching his little girls martial arts.

Faiza Hughell, Chief Customer Officer


An 11 year veteran of RingCentral, Faiza Hughell serves as Chief Customer Officer, focusing on the success of RingCentral’s customers across all markets and geographies including Customer Support, Customer Success, Professional Services, and Implementation. She joined RingCentral in 2010 with a charter to scale SMB sales, helping drive growth through the company’s IPO in 2013. Hughell’s strategic oversight of sales and execution has been a critical driver of RingCentral’s overall business growth from $23 million to over $1.5 billion in annual recurring revenue.

During her tenure, she has built and scaled multiple teams across the sales organization, including Sales Development, BDR, Solutions Engineering & Small Business. Her passion is centered around empowering her customers and teams. Previously, Hughell held the title of Senior Vice President of SMB where she was responsible for the growth of RingCentral’s small business customer base and retention worldwide. Under her leadership, SMB business has grown by over half a billion dollars in revenue.

Hughell has been recognized by The Modern Sale and Collective[i] as a Top 100 Global Sales Leader for 2021, and was included in The Software Report's list of Top 50 Women Leaders in SaaS of 2021. She also received a 2016 Bronze Stevie Award for Female Executive of the Year and a Tribute to Women of Silicon Valley Award for Female Empowerment in 2018. She is also a member of Fast Company’s Executive Board and has been a content contributor to Entrepreneur.

Prior to joining RingCentral, she built and led Small Business and Sales Development teams at Cisco WebEx. As a segment leader, Hughell was focused on Small Business Growth as well as eCommerce.

Hughell works with various charities that provide battered women with job training and interview skills training, using her business prowess to help others find a journey to success.

Jaya Kumar, Chief Marketing Officer


As RingCentral’s Chief Marketing Officer, Jaya Kumar is responsible for all cross-functional marketing activities, including Corporate Communications; Digital, Field, and Solutions Marketing; Strategic Events; and Business Development.

Since joining RingCentral, Kumar has re-imagined the marketing function to accelerate discipline excellence, increase the focus on customers, and grow demand generation. Kumar launched the first brand campaign in RingCentral's history delivering over 30% improvement in quarterly consideration score, as well as delivering gains in RingCentral’s aided awareness and familiarity among target audiences. RingCentral has also been recognized as a market leader in cloud communications by leading industry analyst firms including Gartner, IDC and Frost & Sullivan.

Kumar brings more than 25 years of experience with multiple Fortune 100 companies, including PepsiCo and Kraft Foods/Mondelez, where he held both President and CMO positions. In addition, he has worked in multiple markets of the world, including Asia, the Middle East, Canada, and the US. Most recently, he was Global CMO at Capital Group, one of the world’s largest fund managers with over $2.2 trillion in assets under management for individuals and institutional investors.

Prior to working at Capital Group, Kumar was President and Chief Innovation Officer at UST Global, where he helped transform the organization into a modern, well-integrated digital business. Kumar also served as the President of South East Asia and Senior Vice President of Strategy for Mondelez International. He was responsible for the business in 12 countries, including Hong Kong, Indonesia, the Philippines, Singapore, Taiwan, Thailand, and Vietnam.

During his time at PepsiCo, he held a variety of leadership positions, including President for the Global Nutrition Group, where he was tasked to grow a nutritionally advantaged Health and Wellness portfolio, and President of Quaker Foods North America. As the CMO, Kumar managed all aspects of brand management of a snack portfolio that included multiple billion-dollar franchises such as Lays, Doritos, Cheetos, Tostitos, and Fritos. This included running large sales and marketing teams of over 16,000 people and sales of over $15B. 

Gunjan Aggarwal, Chief People Officer


As RingCentral’s Chief People Officer, Gunjan Aggarwal leads the People & Places function for the company including talent acquisition and development, organization effectiveness, rewards and recognition, people operations, culture & inclusion, and GREW (Global Real Estate and Workplaces).

Gunjan’s team ensures that RingCentral has the most inclusive and productive environment for people to do their best work. Their efforts have been widely recognized recognized with an A+ culture rating and a host of awards including 2021 Comparably awards for Culture, Compensation, Diversity, Happiness, Leadership, Perks & Benefits and Women, amongst others.

Aggarwal is a 20-year industry veteran who joins RingCentral from RELX Group, a world-leading provider of information solutions based on big data analytics for professionals.

Prior to joining RELX, Aggarwal held a variety of leadership positions at Ericsson, where she spent five years, including Vice President of People and Culture. In her role, she supported the media business growth via mergers and acquisitions, attracting software and cloud media talent to build Ericsson’s TV-as-a-service (TVaaS) offerings in a dynamic industry domain.

Before joining Ericsson, Aggarwal held various positions at leading companies including Novartis and Unilever.

Aggarwal holds a Bachelor of Science degree in electronics and communication and a Master’s in business administration from XLRI in Jamshedpur, India.

John Marlow, Chief Administrative Officer and General Counsel


John Marlow has worked at RingCentral for over 14 years and currently serves as Chief Administrative Officer and General Counsel. He led RingCentral’s IPO in 2013, capital raises, and continues to play a critical role in all areas of growth. In his role, he oversees business and legal affairs, people operations, facilities and corporate development. His legal responsibilities include SEC and NYSE compliance; agreements with strategic partners and global service providers; intellectual property; regulatory compliance; litigation; and privacy and security matters. His people operations and facilities responsibilities include managing RingCentral talent acquisition, talent management, total rewards (compensation and benefits), HRIS, and facilities teams globally.

His corporate development responsibilities include M&A and strategic partnership transactions. Marlow took a lead role in negotiating and closing RingCentral’s Avaya, Atos, Alcatel-Lucent and Mitel commercial relationships. He also previously helped lead RingCentral’s EMEA operations and launched their BT reseller relationship.

Before joining RingCentral, Marlow founded and managed his own law firm and, prior to that, was a partner at Reed Smith, LLP, a Law360 Global 20 firm with more than 1,700 attorneys worldwide.

Marlow received his law degree from Berkeley School of Law, and earned his bachelor’s degree, summa cum laude, from Colgate University.

Vlad Vendrow, Co-Founder and Chief Technology Officer


Vlad Vendrow is the key architect of the RingCentral cloud phone solution. He is responsible for enabling RingCentral’s core product innovation and category leadership while ensuring global scalability and availability. He is passionate about empowering people to connect and communicate with unparalleled freedom and ease from their device of choice.

Prior to RingCentral, Vendrow served as the Director of Engineering at Ring Zero Systems and Motorola.

His accomplishments include leading the development of the Ring Zero phone and fax communications software that shipped more than 25 million copies worldwide.

Vendrow has been granted more than 40 patents in the areas of unified communications, fixed-mobile convergence, and cloud services. He holds a master’s degree in computer science and applied mathematics from Saint Petersburg Electrotechnical University in Russia.

Homayoun Razavi, Chief Business Development Officer


Homayoun Razavi is the Chief Business Development Officer at RingCentral. He initially joined RingCentral as Senior Vice President of Global Service Providers. The team has built a unique partnership network with the world’s leading global services providers, including AT&T globally, British Telecom in UK, Deutsche Telekom globally, ecotel in Germany, MCM Telecom in Mexico, TTSL in India, TELUS in Canada, Verizon globally, 1&1 Versatel in Germany, and Vodafone globally. He was subsequently promoted to the role of Chief Business Development Officer, taking on an expanded set of business development responsibilities, including expanding RingCentral’s strategic partnerships beyond global service providers and traditional PBX manufacturers.

Razavi has 32 years of experience working with global service providers. He has served in many successful companies in senior executive roles for more than 20 years. Razavi was with Coriant from 2017 as EVP, Chief Customer Officer, where he was in charge of global sales, marketing, and Business Development and managed a global team of 1,000 people and revenue of $1B. Prior to that, he joined BroadSoft in 2010 (pre-IPO) and built a strong team over his seven year tenure, serving as EVP, Managing Director of America, which delivered 70% of annual revenue. He remained at BroadSoft until 2017 before it was acquired by Cisco.

Prior to Broadsoft, Razavi worked with a number of companies including Lucent, Ascend, Cascade, and MCI (Verizon).

Razavi is also currently serving on the Advisory Board of 5G startup Movandi, was an Academic Board Member of ISDI Digital University, and has served on a number of boards including BlueChip System, Kovio, ENEA, nuPSYS, Hyperoffice, and Ruckus Wireless.

Razavi has received multiple awards from MCI (Verizon) for launching the first data network and another for the launch of the first Fortune 1000 managed services. He also received multiple awards from Lucent for achieving the highest level of revenue for the company.