Security Vendor LogRhythm Replaces Longtime CEO With Outside Hire

SIEM vendor LogRhythm has tapped Attunity President Mark Logan to take over as its next president and CEO. He is replacing Andy Grolnick, who had led the company since 2005.


LogRhythm has replaced its top leader with an executive from outside the cybersecurity industry a year after being purchased by private equity giant Thoma Bravo.

The Boulder, Colo.-based security information and event management (SIEM) vendor tapped Attunity President Mark Logan to take over as its next president and CEO. Logan is replacing Andy Grolnick, who had served as LogRhythm's president and CEO since 2005.

"Mark has decades of experience successfully building and leading global enterprises software and SaaS companies," Thoma Bravo partner Chip Virnig said in a statement. "That experience, combined with his focus on customer success, solution innovation and company culture, makes him the ideal leader for LogRhythm."

Sponsored post

[Related: Another Private Equity Deal: Thoma Bravo To Buy Majority Stake In SIEM Titan LogRhythm]

Grolnick is neither mentioned nor quoted in the press release announcing Logan's appointment as CEO despite leading LogRhythm for all but two years of the company's existence. Neither Thoma Bravo, LogRhythm nor Grolnick immediately responded to questions about the reason for Grolnick's departure.

After raising $126.3 million in seven rounds of outside funding, LogRhythm was purchased in July 2018 by Chicago-based Thoma Bravo for a reported $525 million, according to Momentum Cyber. Since being bought by Thoma Bravo, LogRhythm's headcount has fallen by 8 percent from 670 employees in July 2018 to 617 workers today, according to LinkedIn.

As LogRhythm's new CEO, Logan said he plans to extend the company's market share and leadership in the SIEM, user and entity behavioral analytics (UEBA), network detection and response (NDR), and security orchestration automation and response (SOAR) markets. Virnig said Logan shares Thoma Bravo's vision for those markets, and has a tremendous reputation as an executive manager.

Logan said LogRhythm's platform is an indispensable part of how some of the most sophisticated and effective enterprise security operations in the world detect, investigate, and neutralize advanced threats. Logan wasn't immediately available for additional comment.

"I am thrilled to step into this role and have the opportunity to work with an organization that has LogRhythm's impressive track record of innovation and market leadership," Logan said in a statement. "I look forward to working closely with our customers and business partners to drive our shared success to new levels."

Logan come to LogRhythm after nearly two years as president of Burlington, Mass.-based data integration entity Attunity, where he was responsible for all global field operations including sales, service, and support. Prior to that, Logan spent nearly three years as president and CEO of Bethesda, Md.-based wealth identification platform WealthEngine.

Logan also held leadership positions at data transformation vendor BackOffice Associates (now called Syniti), strategic supply management vendor Emptoris (which was sold to IBM), and telecom expense management vendor Rivermine. Logan's arrival at LogRhythm comes seven months after Barry Capoot became LogRhythm's CFO and four months after Sue Buck joined as SVP of Engineering.

LogRhythm said it works with VARs, MSPs, system integrators (SIs), and consultants. The company in October received a patent for the creation of data monitoring methods that enable risk-based classification of data to highlight the severity of potential threats.