Fractional & Interim CFO
Embedded operating and financial leadership across accounting, FP&A, and HR, sized to your stage and budget, covering a gap or standing in through a transition.
McCauley Street: Fractional CFO & Operating Partner
Senior financial and operating leadership for PE-owned and venture-backed companies, without the full-time hire.
Rushton McGarr is a C-level operator and board member who partners with private equity and venture investors, Founders, and CEOs. Two decades scaling PE-owned and VC-backed businesses across quantum, enterprise SaaS, and energy. He translates a strategic objective into the operating roadmap required to reach it, and builds the team accountable for getting there, leveraging many aspects of EOS. He pairs that operating judgment with AI-enabled finance workflows, so portfolio companies get senior-level output with faster closes, sharper board reporting, and a leaner G&A cost base.
Rushton McGarr
About McCauley Street
An operator's experience, available fractionally.
Rushton McGarr is a C-level executive and board member who has spent two decades scaling private equity and venture-backed businesses. He translates a strategic objective into the operating roadmap required to reach it, and builds the team accountable for getting there, drawing on experience as an operational CFO, President, and COO across quantum technology, enterprise SaaS, and energy.
He is currently the Chief Financial Officer of Ascend Analytics, backed by Rubicon Technology Partners, and previously led finance at Vitruvi Software (Bow River Capital), Infleqtion (NYSE: INFQ), and FullContact, both of which are Foundry Group portfolio companies. Across those roles he has closed equity and debt financings, built G&A teams and installed governance, closed and integrated acquisitions, implemented EOS, and rebuilt management-to-board reporting and credibility.
Investors engage him when a portfolio company needs senior judgment quickly. He now offers that experience on a fractional basis: embedded operating and financial leadership for portfolio companies and their boards, scaled to what the business requires. He runs a modern practice leveraging secure, enterprise-grade AI tools that automate the repetitive work of finance, giving one experienced operator the reach of a much larger team.
- 20+ years as a CFO, President & COO
- PE-owned and VC-backed operator and board member experience
- Industries: quantum, enterprise SaaS, energy analytics, identity & data
- AI-enabled finance that scales output without scaling headcount
Focus Areas
Where a fractional Operating CFO creates value.
Engagements are shaped around your stage and your investors, whether that means owning the finance function outright, backstopping an existing team, or leading a specific event to close.
Capital Events & Financings
Equity and debt raises, M&A, and recapitalizations, from modeling and diligence through negotiation and close to integration.
CFO Transitions & Team Building
Assessing the finance and G&A team already in place, closing capability gaps, and recruiting and developing the leaders accountable for execution.
Board Reporting & Governance
Management-to-board reporting packages, scorecards, budgets, delegation-of-authority matrices, and committee charters that hold up as you scale.
Value Creation & Integration
Post-close 100-day planning, cost restructuring, KPI and unit-economics discipline, and the operating rigor that turns a plan into realized value.
PE & Venture Board Support
A trusted, on-call resource for funds and their portfolio company boards: diligence support, independent board and advisory seats, and senior operating judgment without adding headcount.
Approach
Operator judgment, AI-driven scale.
McCauley Street pairs two decades of CFO and operating judgment with AI built into the daily work of finance. Forecasting, variance analysis, pipeline reports, and board-package preparation are accelerated with secure, enterprise AI tools, so time goes to the decisions that move enterprise value. Portfolio companies get the output of a fully staffed finance function without carrying its full headcount.
Scale without headcount
AI-enabled workflows absorb the repetitive work of reporting and analysis, so a lean team can support a growing company and G&A grows slower than revenue.
Operator-reviewed
Rushton reviews and stands behind every AI-assisted model, forecast, and board deliverable. The tools speed up the work; the judgment and accountability stay with an experienced CFO.
Confidential & secure
Company and investor data goes only into enterprise AI tools whose terms prohibit training on your data, never into consumer tools that fall short of that standard.
Leverage that stays
Automations, dashboards, and AI workflows are built and documented inside your systems, so your team keeps the leverage, and the scale, after the engagement ends.
Experience
A career built scaling PE-owned and VC-backed companies.
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Chief Financial Officer
Ascend Analytics (Rubicon Technology Partners)Leading finance and shared services for the PE-owned market intelligence platform for the power industry. Rebuilt the finance and HR teams, implemented controls, integrated AI into workflows, developed all Board reporting, and delivered multi-divisional budgets and a clean audit.
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Chief Financial Officer
Vitruvi Software (Bow River Capital)CFO of the PE-owned construction-management SaaS platform. Restructured annualized OPEX run rate, stood up management and board reporting, installed SaaS metrics dashboard, and built committee governance framework and cap-table infrastructure.
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Chief Financial Officer
Infleqtion (NYSE: INFQ) / (Foundry Group)CFO of the cold-atom quantum technology leader. Closed a $130M Series B, led a Big 4 audit to PCAOB/SEC standards, closed an acquisition of a software company, and built the finance team.
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Chief Financial Officer
FullContact Inc. (Foundry Group)CFO of an identity-resolution platform (Inc. 5000) that scaled ARR from ~$5M to ~$20M. Raised $48M in equity and debt, closed and integrated five M&A transactions including assets in Israel and India, and owned HR, legal, facilities, capital planning and financial reporting.
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President, COO & Board Member
concept3D Inc. (Lacuna)Recruited to scale the venture-backed interactive-mapping SaaS company. Drove 100%+ year-over-year revenue growth, secured debt and equity funding, and led finance, operations, product, and sales.
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Co-Founder
Market Force Information (Centennial Ventures & Boulder Ventures)Co-founded and scaled the customer-experience analytics leader from idea to over $60M in profitable revenue and 500+ employees, raising $53M in equity and $21M in debt to acquire and integrate five global businesses.
Education
- University of Texas at Austin, Red McCombs School of Business, MBA with highest honors
- University of North Carolina at Chapel Hill, B.A. in Economics & Political Science
Top skills: Financial Oversight · Capital Raising & M&A · FP&A & SaaS Metrics · Board Reporting & Governance · Team Building · AI-Enabled Finance