One person ties a major client's loyalty to themselves, keeping colleagues away and knowledge undocumented, so the firm cannot discipline or overrule them without risking the account.
An example
Roughly 35 percent of a regional accounting firm's fees came through one audit partner and three privately held manufacturers he had served for two decades. No other partner had attended a substantive meeting with any of them, and the client files in the firm's system held engagement letters and little else. When the partner refused to adopt the firm's new review procedures, and two managers asked to transfer off his team, the managing partner raised it at the partners' meeting. The response was that the clients called him directly and would follow him. The meeting moved on. A year later, at renewal, the largest client's finance director asked the managing partner, whom she had never met, who else at the firm knew her business.
Why it works
By building the impression that they are the reason the client stays, the broker makes leaving things as they are look better. Disciplining or replacing them looks worse, since the firm has no parallel relationships to fall back on, and costlier, since the implied threat is a defection with the account. The threat is rarely stated. It works through the firm's own calculation. The move depends on revenue concentrated in the account, a firm unwilling to pay for redundant coverage, loose documentation habits, and the broker's restraint. Once the broker leaves, the hold is gone.
The thinking behind it
Oliver E. Williamson Asset specificity, from The Economic Institutions of Capitalism (1985): investments specialized to one relationship lose much of their value outside it, leaving the parties dependent on each other and exposed to being taken advantage of. A client relationship held by one partner is a specific asset that partner controls, and the firm's dependence on it is the hold-up. Williamson's answer is governance: pairing, documentation, and shared credit keep the asset with the firm.
Mark Granovetter The strength of weak ties, from The Strength of Weak Ties (1973): acquaintances who connect otherwise separate groups act as bridges that carry information between them. A broker who is the only bridge between the firm and a client controls everything that crosses it. The defense is to build more bridges, more people at the firm who know the client, so the connection no longer runs through one person.
Warning signs
One account's contacts, notes, and meetings appear only in a single person's calendar and inbox. Junior staff and other partners are kept out of client meetings, introductions never happen, and the renewal conversation is handled alone. Client preferences are missing from the shared system. Requests for joint coverage get answered with concern for the relationship, and discipline for the broker keeps getting postponed.
How to defend yourself
Start before you need it. Put a second senior person on every major account, with real meetings, and make recording client knowledge in the shared system a condition of the role.
- Measure revenue concentration by person and by account, and review it at the leadership level.
- Reach the client through legitimate channels: procurement, the client's own executives, service reviews.
- Credit accounts to teams in compensation, so sharing coverage costs nobody pay.
- Decide in advance, and in private, what the firm will do if the broker defects and what it can absorb.
A firm that has decided it can absorb a defection stops paying ransom.
How a leader shuts it down
Set relationship-handoff norms and mandatory pairing on every major account, and apply them to the most senior people first. Reward team-based account credit. Encourage clients' procurement teams to deal with several contacts. Refuse to let revenue concentration buy exemptions from rules everyone else follows, since the exemption is what makes capture pay.