Marty Brennan Joins growth[period] as Chief Operating Officer

Proven operator to drive operational excellence and accelerate firm's growth strategy

Apr. 6, 2026 at 1:37pm

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growth[period], a strategic advisory firm serving public- and private-sector clients, announced that Marty Brennan has joined the firm as Chief Operating Officer. In this role, Brennan will focus on translating strategy into execution, strengthening client relationships, and scaling the firm's ability to deliver as growth[period] continues to expand.

Why it matters

Brennan's appointment reflects growth[period]'s ambitious growth trajectory and the firm's need for an experienced, hands-on operator to oversee day-to-day operations and ensure the successful execution of its strategic vision. His deep industry knowledge and proven track record of driving outcomes across complex transactions will be crucial as growth[period] seeks to solidify its position as a leading strategic advisory firm.

The details

As COO, Brennan will be responsible for driving operational excellence across growth[period], with a focus on translating the firm's strategy into effective execution. He will work to strengthen client relationships and scale the firm's delivery capabilities as it continues to grow. Brennan is known for his operational rigor and hands-on approach, having built a strong reputation among industry executives and private equity firms for driving successful outcomes across transactions of all sizes.

  • Brennan joined growth[period] in April 2026.

The players

Marty Brennan

Brennan is the new Chief Operating Officer at growth[period]. He has more than 20 years of experience advising public and private sector organizations on business, operational, and technology strategy.

Courtney B. Spaeth

Spaeth is the CEO of growth[period], a strategic advisory firm serving clients at moments of growth, complexity, and transformation.

growth[period]

growth[period] is a strategic advisory firm that provides management consulting, business development, geopolitical risk, strategy, and transaction advisory services to companies in highly regulated industries.

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What they’re saying

“Bringing Marty Brennan on as Chief Operating Officer reflects our exciting growth trajectory. Marty is a proven operator with the rare ability to translate strategy into execution at scale—exactly what is required as we continue to expand.”

— Courtney B. Spaeth, CEO, growth[period]

What’s next

As growth[period] continues to expand its operations and client base, the firm will look to Brennan's leadership and operational expertise to ensure a smooth transition and successful execution of its strategic initiatives.

The takeaway

The addition of Marty Brennan as Chief Operating Officer underscores growth[period]'s commitment to operational excellence and its ambitious growth plans. Brennan's proven track record of driving outcomes across complex transactions and his deep industry knowledge will be invaluable as the firm seeks to solidify its position as a leading strategic advisory firm.