Tasks for an information security consultant

Answer:
I am sorry but I am not sure if I have understood your question 100%, but generally tasks for the information security consultant mainly are the development of the documentation for the ISMS, and also, he can give support to technical profiles for the implementation of the documentation in the organization.

Anyway, in some companies the information security consultant can be also the CISO (role that usually manages the ISMS in the organization), so this article can be interesting for you “What is the job of Chief Information Security Officer (CISO) in ISO 27001?” : https://advisera.com/27001academy/knowledgebase/what-is-the-job-of-chief-information-security-officer-ciso-in-iso-27001/

This article can be also interesting for you “Roles and responsibilities of top management in ISO 27001 and ISO 22301” : https://advisera.com/27001academy/blog/2014/06/09/roles-and-responsibilities-of-top-management-in-iso-27001-and-iso-2 2301/

And also this one "3 phases of delivering an ISO 27001/ISO 22301 consulting job" : https://advisera.com/27001academy/blog/2015/09/28/3-phases-of-delivering-an-iso-27001iso-22301-consulting-job/

Finally, these materials will help you to understand better the roles and responsibilities in an ISMS:
- free online training ISO 27001 Foundations Course https://advisera.com/training/iso-27001-foundations-course/
- book Secure & Simple: A Small-Business Guide to Implementing ISO 27001 On Your Own https://advisera.com/books/secure-and-simple-a-small-business-guide-to-implementing-iso-27001-on-your-own/