Doing

Technical experts working in or consulting to a business are intricately focussed on doing rather than showing knowledge.

The technical specialists contribute to the business by doing tasks such as writing documents, creating designs, preparing justifications or checking the work done by others. 

They use their deep technical knowledge to create a better business.   This is different to excellent managers and leaders, who rightly spend more time showing and helping others succeed. 

Sometimes it is difficult to convince management of the value brought through that technical expertise.  Technical leadership is different to team or personnel leadership, but no less important.