Questor CEO Audrey Mascarenhas has returned as president and chief executive officer, effective immediately, the emissions technology company announced on October 27, 2026. She succeeds Mike Lindsay, who had served in the roles on an interim basis since April.

Key Takeaways

  • Mascarenhas previously led Questor as president and CEO from 2005 until April 2026.
  • Her return follows a shareholder vote to change the board’s composition at the company’s September annual meeting.
  • Questor says discussions with major clients have resumed, but it did not announce any resulting contracts.

Questor CEO returns after board changes

Mascarenhas has been with Questor since 1999 and has spent more than 25 years developing and commercializing its clean combustion technology. Before joining the company, she spent 17 years at Gulf Canada Resources.

Questor’s annual general meeting was initially scheduled for June 24, moved to June 15 and then postponed. When the meeting was held on September 9, shareholders voted for a change in the board’s composition. The company said it incurred significant costs from a proxy contest and related proceedings.

Company focuses on client discussions

Questor said discussions with major clients resumed following Mascarenhas’s return. Its board and management believe the engagement could support long-term growth, although the announcement did not identify new contracts or provide financial targets.

The Calgary-based company designs, manufactures and services clean combustion systems used to reduce pollutants in waste gas streams. Its shares trade on the TSX Venture Exchange under the symbol QST.

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