Mayor Martin J. Walsh has chosen as his chief communications officer Lisa Mansdorf Pollack, a City Hall veteran who has been directing communications for the city’s Department of Neighborhood Development since last year.

Pollack, who also spent nine years handling corporate and crisis communications for the Denterlein public relations firm, plans to take over the new mayor’s communications team beginning Wednesday. Her mission is to streamline communications across agencies and media, she said.

“There are so many more platforms to think about right now,” Pollack said in an interview Thursday. The mayor wanted a communications chief “with the capacity to look at all of those things in a very unified way and pull it all together,” she said.

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Pollack is assuming the same title Dot Joyce held with former mayor Thomas M. Menino. Joyce, who made $133,926 as of August, was a member of the mayor’s Cabinet. Walsh is considering a restructuring of his Cabinet, and it is not clear whether the communications post will remain part of it or what it will pay.

Pollack joins Walsh press secretary Kate Norton and press assistant Emilee Ellison .