Due Diligence on People: The Missing Chapter in Deals

The deal memo was thorough. Sixty pages on financials. Forty on market position. Thirty on legal and regulatory risk. Twenty on technology and IP.

Human capital due diligence got three pages. Two of those were org charts.

Eighteen months later, the acquisition was failing. Not because the financials were wrong. Not because the market shifted. Because the CFO who'd built the company couldn't operate under PE ownership, the COO's decision-making style clashed with the new board's governance expectations, and the VP of Sales, who'd driven growth, resigned within six months of close.

The deal team had spent four months validating every financial assumption. They'd spent four days on leadership assessment, mostly reference calls and a dinner with the CEO.

This is the gap that destroys deal value. Not bad financial analysis. Incomplete human capital due diligence.

 

The Checkbox Problem

Financial due diligence asks: are the numbers accurate, and what do they predict?

Legal due diligence asks: what risks exist, and how do we structure around them?

Human capital due diligence, as typically practiced, asks: Do we like these people, and do their resumes check out?

That's not due diligence. That's a checkbox. Worse, likability is actively misleading in diligence contexts; the executives who present well in management meetings are often the ones most calibrated for the conditions you're about to change.

The standard approach evaluates whether executives are competent. It doesn't evaluate whether their calibration matches post-transaction conditions. Not "is the CFO capable?" but "is the CFO calibrated for what this company will become under new ownership?" Not "does the COO have relevant experience?" but "do the COO's operating parameters match the decision architecture we're about to impose?"

The executives who built the company under founder ownership are calibrated for founder conditions. The question is whether that calibration transfers. Most deal teams never ask. They assume competence is portable. It isn't.

What Changes Post-Transaction

The conditions that follow a transaction are rarely the conditions that preceded it.

Pace changes. PE ownership typically accelerates decision cycles. The CFO who had six weeks to prepare board materials now has six days. The COO who built consensus over months must execute in weeks. Executives calibrated for deliberate pace often can't adapt,  not because they lack capability, but because their operating rhythm doesn't match the new tempo.

Governance changes. Founder-led companies often operate with informal decision rights. Post-transaction, decision architecture becomes explicit. The executive who thrived reading the founder's intent now faces structured approval processes, defined escalation paths, and accountability mechanisms they've never navigated. Their track limits were calibrated for one governance system. They're now operating in another.

Risk tolerance changes. Strategic buyers want integration and synergy extraction. PE owners want growth acceleration or operational transformation. The executives who succeeded by managing risk conservatively may be calibrated for exactly the wrong posture. The ones who succeeded through aggressive bets may not survive a more disciplined capital allocation framework.

Time horizons change. A founder building generational wealth operates differently from a PE fund with a five-year exit window. Executives calibrated for long-term positioning often struggle with the quarterly intensity of financial sponsor ownership.

None of this is about competence. A CFO can be excellent and still be miscalibrated for post-transaction conditions. The deal memo that doesn't assess calibration match isn't incomplete. It's blind to the primary driver of post-close executive performance.

 

What McLaren's Acquisition Pattern Reveals

When Lawrence Stroll's consortium acquired Aston Martin in 2020, the team had financial resources, brand equity, and a clear strategic vision. What they didn't have was a technical organization calibrated for front-running competition.

The solution wasn't replacing incompetent people. It was acquiring differently calibrated people, recruiting technical leadership from Mercedes and Red Bull, whose operating parameters matched championship-level conditions.

The executives who'd built Aston Martin through its midfield years weren't failures. They were calibrated for midfield conditions: constrained budgets, incremental development, survival-oriented decision-making. Championship conditions require different calibration: aggressive development cycles, calculated technical risks, performance-over-stability trade-offs.

The parallel to M&A is direct. The management team that built a company to acquisition-readiness is calibrated for that journey. The question is whether they're calibrated for the next chapter, and if not, whether the deal model accounts for the leadership transition costs that will follow.

Most deal models don't.

 

The Calibration Gaps That Kill Deal Value

Three patterns account for most post-transaction executive failures. Each is predictable. Each is assessable before close. Each is routinely missed.

The Growth-to-Restructuring Gap. The CFO who built the company through expansion often can't navigate contraction. Growth CFOs optimize capital deployment, investor narrative, and infrastructure scaling. Restructuring requires different instincts: cash preservation, difficult workforce decisions, and stakeholder management under stress. The deal team that assumes "strong CFO" means "CFO for all conditions" will discover the gap when conditions shift.

The Informal-to-Formal Gap. Executives who thrived under founder decision-making often struggle with board governance. They're calibrated for reading a single decision-maker, for informal influence, for speed through relationship rather than process. Post-transaction governance requires structured proposals, committee navigation, and documented accountability. The COO who could get things done with a hallway conversation may be ineffective when decisions require board materials and approval workflows.

The Owner-Operator-to-Professional-Manager Gap. Founder-adjacent executives often share the founder's ownership mentality, long hours, personal investment, and blurred boundaries. PE and strategic ownership typically expect professional management: a defined scope, a sustainable pace, and scalable practices. Executives calibrated for owner-operator intensity sometimes can't downshift. Others burn out. Either outcome damages post-transaction execution.

When I conduct executive assessments as part of transaction due diligence, these three gaps surface repeatedly. The executives aren't weak. Their calibration doesn't match where the company is going. That's not a development problem. It's a deal-structure problem, and it should be priced into the model.

 

The Cost of Getting This Wrong

Executive miscalibration post-close doesn't announce itself. It surfaces gradually, missed milestones attributed to "integration challenges," culture friction blamed on "change management," departures explained as "not the right fit."

The CFO who can't adapt to PE pace creates reporting gaps that damage board confidence. The board loses confidence not just in the CFO but in the management team. Eighteen months later, the conversation shifts from "value creation" to "what went wrong."

And the replacement cost isn't just the search fee and transition time. It's institutional knowledge walking out, relationships needing rebuilding, and organizational disruption during a period when execution matters most. One miscalibrated executive can cascade into instability that takes years to repair.

 

The Chapter That Should Exist

Every serious deal memo includes sensitivity analysis on financial assumptions. What if revenue grows at 8% instead of 12%? What if margins compress? What if integration takes longer?

Human capital miscalibration should be modeled the same way integration risk is modeled, with probabilities, impacts, and mitigation costs. What if the CFO can't operate at PE pace? What if the COO's governance style clashes with the new board? What if the sales leader can't retain their team through transition?

These aren't unknowable risks. They're assessable risks that most deal teams choose not to assess, because financial due diligence has established frameworks, and human capital due diligence is treated as soft, subjective, and secondary.

The executives who built the company are calibrated for the conditions that existed. The question due diligence must answer is whether that calibration transfers to the conditions you're about to create.

If it doesn't, and you didn't model for it, the returns in your deal memo are overstated. Not because the financial analysis was wrong. Because you treated human capital as a checkbox instead of a variable.

That's not bad luck. That's incomplete diligence priced as if it were complete.