Who we are

Mr. Frank Baker is a Co-Founder and Managing Partner of Siris. Together with Peter Berger and Jeffrey Hendren, he launched Siris in 2011 and helped establish the Firm’s investment strategy, which focuses on driving value creation in mature technology companies with mission-critical products and services, facing industry changes or other significant transitions. Since its founding, Siris has raised four institutional funds, and Mr. Baker has helped oversee the Firm’s platform equity investments, in addition to non-control investments. Prior to founding Siris, Mr. Baker was a Managing Director at Ripplewood Holdings LLC, a global private equity firm. He started his career in the mergers and acquisitions group of Goldman Sachs and earned an M.B.A. from Harvard Business School and a B.A. in Economics from the University of Chicago. Mr. Baker currently serves as a trustee of the University of Chicago and has been a major supporter of the university’s New Leaders Odyssey Scholarships. Mr. Baker is chairman of Robert F. Kennedy Human Rights, and a board member of Sponsors for Educational Opportunity.

Frank Baker Pays Off Tuition For Spelman College Graduates

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Frank on Measured Growth

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Frank on Siris' Investment Strategy

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Frank's Perspective on Team Building

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Mr. Peter Berger is the Chairman and Co-Founder of Siris, bringing more than 50 years of experience across private equity, banking, and consulting—over 30 of those years as a direct private equity investor in leadership roles.

As Chairman, Mr. Berger provides strategic oversight and stewardship, guiding the firm’s long-term vision, governance, and investment discipline. He works closely with the leadership team to ensure the continued success of Siris’s mission to create lasting value through its investment approach.

Alongside Frank Baker and Jeffrey Hendren, Mr. Berger co-founded Siris in 2011 and, as a Managing Partner, was instrumental in shaping the firm’s distinctive investment philosophy. Across Siris’s portfolio companies, he has served as Chairman or director and has led multiple Audit and Risk, as well as Human Capital Committees.

Before founding Siris, Mr. Berger was a founding member and Managing Director at Ripplewood Holdings LLC, a global private equity firm. Earlier in his career, he served as Senior Partner and Global Head of the Corporate Finance Group at Arthur Andersen and as a Managing Director at Bear Stearns’ investment bank.

Mr. Berger holds an M.B.A. from Columbia Business School and a bachelor’s degree from Boston University. He has been a guest lecturer at Columbia Business School and previously served on the Board of Directors at Jazz at Lincoln Center, where he chaired the Finance Committee.

Mr. Dave Calamai (Managing Director) joined Siris in 2023. Dave serves on the firm's Investment and Operating Committees and currently oversees the firm's investments in BearCom and EFI. Prior to joining Siris, Mr. Calamai was a Principal at Tailwind Capital, where he focused on investments in the technology services, healthcare services, and business services sectors. Prior to his time at Tailwind, Mr. Calamai worked in the healthcare investment banking group at Morgan Stanley. Mr. Calamai received a B.A. in Biology and a M.S. in Commerce from the University of Virginia.

Mr. Tiger Chen (Senior Associate) joined Siris in 2023. Prior to joining Siris, Mr. Chen was an Investment Banking Analyst at The Foros Group in New York. Mr. Chen graduated from Princeton University where he received a B.S.E. in Operations Research and Financial Engineering.

Mr. Daniel Cockerill (Associate) joined Siris in 2024. Prior to joining Siris, Mr. Cockerill was an Investment Banking Analyst in the Technology Group at Barclays in San Francisco. Mr. Cockerill graduated from the University of North Carolina at Charlotte where he received a B.S.B.A. in Finance and from Vanderbilt University where he received a M.S. in Finance.

Mr. Sandeep Guleria (Partner) joined Siris in 2012. Sandeep serves on the Investment Team with responsibility for sourcing, executing, and managing investments across the technology sector. Sandeep serves on the firm's Investment and Operating Committees and currently oversees the firm's investments in Gigamon and Newfold Digital. Prior to Siris, Mr. Guleria worked in the Mergers and Acquisitions and Global Communications groups at Citigroup in New York. He graduated from New York University where he received a B.Sc. with a concentration in Finance and Accounting.

Mr. Seth Harward (Managing Director – Business Development) joined Siris Capital Group in 2026. In his role, Mr. Harward oversees the firm’s business development activities.  Prior to joining Siris, Mr. Harward was most recently a Managing Director at Piper Sandler in the firm’s merchant banking group, where he helped lead the firm’s technology investing efforts and served on the Investment Committee.  Prior to joining Piper Sandler, Mr. Harward was a Partner at Frontier Growth, where he evaluated growth-stage software companies and was instrumental in building and leading the firm’s origination and business development capabilities.  Earlier in his career, Mr. Harward served as Director of Business Development at the Council for Entrepreneurial Development in Research Triangle Park, where he developed and managed strategic relationships with investment firms, intermediaries, corporations, and entrepreneurs to support the entrepreneurial business community across the Southeast.

Mr. Jeffrey Hendren is a Co-Founder and Managing Partner of Siris. Together with Frank Baker and Peter Berger, he launched Siris in 2011 and helped establish the Firm’s investment strategy, which focuses on driving value creation in mature technology companies with mission-critical products and services, facing industry changes or other significant transitions. Since its founding, Siris has four institutional funds, and Mr. Hendren has helped oversee the Firm’s platform equity investments, in addition to non-control investments. Prior to founding Siris, Mr. Hendren served as a Managing Director at Ripplewood Holdings LLC, a global private equity firm. Mr. Hendren started his career at Georgia Pacific and was a member of the mergers and acquisitions group of Goldman Sachs. Mr. Hendren earned an M.B.A. from Harvard Business School and a B.Sc. from Indiana University.

Mr. David Mathai (Associate) joined Siris in 2025. Prior to joining Siris, Mr. Mathai was an Investment Banking Analyst in the Media & Telecom Group at Rothschild & Co. in New York. Mr. Mathai graduated from the University of Maryland where he received a B.S. in Finance and a Master of Finance.

Mr. Matthew Montaquila (Vice President) joined Siris in 2021. Prior to joining Siris, Mr. Montaquila was an Investment Banking Analyst in the Technology, Media, and Telecommunications Group at Guggenheim Securities in New York. Mr. Montaquila graduated from University of Michigan with a B.B.A. from the Stephen M. Ross School of Business.

Mr. Kevin O'Brien (Principal) rejoined Siris in 2019 as a Senior Associate. Prior to joining Siris, Mr. OBrien was a Senior Director of Corporate Development and Finance at Pulse Secure (a Siris portfolio company) and Research Analyst at Point72 Asset Management, where he focused on public equity investments in the Technology, Media and Telecommunications industries. Prior to that, he was an Associate at Siris and an Analyst at Morgan Stanley. Mr. OBrien graduated from the University of Notre Dame, where he received a B.B.A. in Finance and Economics.

Mr. Chase Rosett (Senior Associate) joined Siris in 2026. Prior to joining Siris, Mr. Rosett was an investment professional at Tyree & D’Angelo Partners in Chicago. Mr. Rosett received an MBA from the UCLA Anderson School of Management, as a Chartered Financial Analyst and received a BBA in Finance and Entrepreneurship from Indiana University.

Mr. PJ Shalhoub (Vice President) joined Siris in 2022. Prior to joining Siris, Mr. Shalhoub was an Investment Banking Analyst in the Technology, Media, and Telecommunications group at Rothschild & Co in New York. Mr. Shalhoub graduated from Boston College, where he received a B.A. in Mathematics as well as a minor in Hispanic studies.

Mr. Samuel Sullivan (Associate) joined Siris in 2025. Prior to joining Siris, Mr. Sullivan was an Investment Banking Analyst in the Technology Groups at Barclays and UBS in San Francisco. Mr. Sullivan graduated from Middlebury College in Vermont where he received a B.A. in International Politics and Economics.

Mr. Grant Weisberg (Principal) joined Siris in 2018. Prior to joining Siris, Mr. Weisberg was an Investment Banking Analyst in the Mergers & Acquisitions Group at Credit Suisse in New York. Mr. Weisberg graduated from University of Chicago where he received a bachelor's degree in Economics and a minor from the Booth School of Business.