Mark Matheos

Chief Financial Officer Dragos

Last Reviewed: September 27, 2026

Executive Summary

Mark Matheos is Chief Financial Officer of Dragos, the privately held Washington, DC company that protects the operational technology behind electric grids, water systems, refineries and ports from cyber attack. He joined in November 2024 after eight years at Appian Corporation, the publicly listed software company, where he worked his way up the finance organisation from Vice President, Assistant Controller to Chief Accounting Officer and, from April 2022, Chief Financial Officer. He arrived with both a controller’s grounding and public-company CFO experience; in September 2026 Dragos announced its acquisitions of NetRise and runZero.

Career Highlights

• Chief Financial Officer of Dragos since November 2024, overseeing its financial strategy and operations.
• Chief Financial Officer and principal financial officer of Appian Corporation from April 2022 to November 2024, succeeding long-serving CFO Mark Lynch.
• Chief Accounting Officer of Appian from December 2021, and before that its Senior Vice President, Global Corporate Controller.
• Joined Appian in October 2016 as Vice President, Assistant Controller and became Vice President, Corporate Controller in April 2017.
• Began his career at Ernst & Young; a Certified Public Accountant in Virginia.

Professional Journey

Matheos studied Accounting and Information Systems at Virginia Tech and began his career at Ernst & Young. Dragos describes him as having then served in finance leadership roles at large public technology companies before Appian.

He joined Appian Corporation in October 2016 as Vice President, Assistant Controller. He became Vice President, Corporate Controller in April 2017 and Senior Vice President, Global Corporate Controller in January 2021. When CFO Mark Lynch announced his retirement in December 2021, Appian’s board named Matheos Chief Accounting Officer and principal accounting officer, effective 31 December 2021. On 1 April 2022 he succeeded Lynch as Chief Financial Officer, taking on the principal financial officer role while keeping the principal accounting officer responsibilities. Dragos credits him with overseeing Appian’s growth from 500 employees to more than 2,000 and helping steer the company through its IPO process.

In October 2024 he told Appian he would leave, effective 8 November 2024, to take a CFO role at another company. Dragos announced him as its Chief Financial Officer on 19 November 2024, alongside Mark Packham as Chief Marketing Officer and the move of Darren Sankbeil, the previous CFO, to Chief Strategy Officer. “Dragos is in an exciting, fast-growing market, has an undeniably strong company culture, and most importantly, a mission so clearly important that I am honored to be a part of it,” he said at the time.

Dragos was co-founded by Robert M. Lee, who leads it as Chairman and CEO, and serves operators in electric power, oil and gas, manufacturing, water, transportation, mining and government. By late 2024 it had raised more than $384 million, including a $200 million Series D. In September 2026 it announced that it had acquired NetRise and runZero, describing the combination as an end-to-end platform for what it calls xOT security.

Education

Virginia Tech

B.S., Accounting and Information Systems