How interim leadership strengthens succession planning

Succession planning has long focused on identifying who could lead next. That work remains essential, but it does not resolve every transition. A critical role may be changing as the business transforms, the preferred successor may need more time, or the leaders available to provide temporary coverage may already be carrying full portfolios. In those moments, accelerating a permanent appointment or dividing the role among incumbents can create more risk than it solves.

Chief People Officers and other human resources leaders can prepare for that gap by building interim leaders and external experts into succession plans before a vacancy occurs. In recent client requests, we are seeing executive teams consider this broader bench alongside internal successors and emerging talent. It gives the organization a defined way to protect execution, test the future mandate, and continue developing internal candidates without forcing a permanent decision before the business is ready.

Access to interim leaders can complement a strong internal pipeline with added capacity and expertise at pivotal moments. This broader bench gives the organization more flexibility when immediate leadership needs and long-term succession plans fall out of sync. 

When immediate needs outpace the succession plan

When a critical leader exits, redistributing the work among current executives can look like the fastest solution. Yet when those executives are already accountable for full portfolios, shared coverage can blur decision rights, fragment ownership, slow approvals, and pull attention from other priorities. The role may be covered on an organization chart while important work loses a clear, sustained owner.

The risk is greater when the transition coincides with a transformation, integration, operating model redesign, or another strategic shift. The organization needs leadership capacity at the same time it is reconsidering the scope of the role, its reporting relationships, and the capabilities required for success. A potential successor may be progressing well but still lack experience with part of the mandate. In other cases, the role itself is changing too quickly for the executive team to define its permanent shape with confidence.

This creates a decision that conventional replacement planning doesn’t fully answer: Should the business refill the role as it was, or use the transition to determine what it should become? A permanent appointment made too quickly can lock the company into a structure before that question is settled. An interim leader can provide accountable leadership while the executive team works through the answer.

Four ways interim leaders can strengthen succession planning

The value of an interim appointment depends on the business problem it is designed to solve. Across the leadership transitions and interim talent needs clients bring to us, four applications are especially relevant to succession planning:

• Stabilize a critical role. An experienced interim leader can preserve continuity, maintain decision quality, and give employees, customers, and the board a clear point of accountability while the organization develops an internal successor or conducts a permanent search.

• Sustain execution through change. Transformations, integrations, restructurings, and operating model shifts don’t pause during a leadership transition. An interim leader with relevant experience can own the work, maintain momentum, and keep strategic commitments from becoming secondary to the search process.

• Test an evolving mandate. When the future shape of a role is unclear, an interim leader can operate within a proposed structure and reveal where scope, decision rights, reporting lines, or capability requirements need to change. The organization can use that evidence to define the permanent role more precisely.

• Prepare an emerging successor. A well-placed interim can mentor an internal candidate, support targeted stretch opportunities, and offer an evidence-based view of readiness. The successor gains time to build missing experience and can enter a role with clearer expectations, stronger sponsorship, and the resources needed to succeed—instead of inheriting an unsettled mandate before the organization is prepared to support them.

One assignment may serve more than one of these purposes, but the priorities must be explicit. An interim asked to stabilize operations, redesign the role, advance a transformation, and develop a successor can’t treat every objective as equally urgent. Defining the sequence, authority, and expected outcomes turns flexible capacity into a disciplined succession tool.

Plan for flexibility before it is needed

The strongest time to consider interim leadership is before a critical role opens. Once disruption occurs, urgency narrows the available choices and can push the organization to prioritize speed over fit. CPOs can improve readiness by identifying the roles where a vacancy—or a material change in mandate—would have the greatest effect on performance.

The analysis should extend beyond the CEO and direct reports. Business unit leaders, transformation executives, and leaders who hold scarce technical, operational, or institutional knowledge may create significant continuity risk. For each role, the executive team can test realistic scenarios: What if the preferred successor needs another year of development? What if a transaction changes the role’s scope? When would an interim appointment be more effective than redistributing responsibilities or accelerating a permanent search?

Once those broader decisions are made, they should inform the design of the specific engagement. Three decisions matter most:

Set the mandate and authority

A focused scope should distinguish what the interim leader is expected to own, advance, or leave for the permanent successor. The leader also needs clear authority over the decisions, resources, and teams required to move the work forward without repeated escalation.

Prepare the organization to support the work

A visible executive sponsor should reinforce the mandate, align key stakeholders, and remove organizational barriers. Rapid access to the right people, information, and business context allows the interim leader to contribute quickly rather than spending the early weeks negotiating access or clarifying basic expectations.

Define the outcomes and handoff

The organization should specify what needs to be achieved, stabilized, or learned during the assignment, including priorities for the first 90 to 180 days. A knowledge-transfer plan should capture decisions, relationships, and context so the permanent leader or internal successor can take over without losing momentum.

This preparation does more than improve an eventual interim placement. It forces a useful discussion about where continuity risk sits, how much capacity the current leadership system can absorb, and which capabilities the organization may struggle to access quickly. Those answers make the broader succession plan more realistic.

Building more flexibility into succession planning

Leadership transitions affect the speed and quality of decisions, the consistency of execution, employee confidence, and the organization’s ability to deliver on strategic commitments. CPOs can connect succession planning more directly to enterprise performance by preparing for the period when immediate leadership needs outpace the longer-term succession plan.

This approach brings internal development and flexible leadership capacity into the same system. It preserves the discipline of building successors from within while giving the executive team another option when timing, complexity, or uncertainty creates a gap. Used deliberately, an interim leader can protect the business through that gap and leave the permanent successor with a clearer mandate and a stronger platform for success.

A strong succession plan identifies who could lead next. It should also give the organization the capacity and flexibility to keep leading when circumstances change.

About the author

Sunny Ackerman (sackerman@heidrick.com) is the global managing partner of the On-Demand Talent Practice and partner-in-charge of Heidrick & Struggles’ Los Angeles office.