After a bad year on Wall Street and a diversity spat with a former senior engineer that went public, Twitter has decided to replace its head of diversity and inclusion.

Twitter VP of Diversity and Inclusion Janet Van Huysse is leaving the company and being replaced by former director of worldwide inclusion and diversity at Apple, Jeffery Siminoff, as Twitter's employees announced through its own social network. Van Huysse helped build Twitter's human resources department over the course of six years, as the company's worldwide staff grew ten fold.

The issue of diversity at Twitter is a complicated one, and an issue for which the company has taken fire throughout the year.

As Re/code noted, when the company's current CEO Jack Dorsey took the helm this summer, he made it clear that creating a more diverse workforce would be a high priority at Twitter going forward. This, after photos leaked showing that Twitter had recently thrown a "frat-themed" party, at the same time the company was being sued for gender discrimination.

Soon after, Twitter released its 2015 diversity transparency report to mixed reactions. The report showed that Twitter was dominated by white and Asian men -- which was not much of a surprise for a Silicon Valley company.

But as The Wall Street Journal pointed out, Twitter's diversity figures for women in leadership and technical roles in 2015 were worse compared to many of its technology peers. And the proportion of underrepresented minorities like Blacks and Latinos had actually dipped lower from the previous year.

On the other hand, Twitter produced something rather rare in its 2015 diversity update: measurable diversity goals for the next year. Those goals were outlined on Twitter's blog, by the way, by outgoing diversity chief Van Huysse.

The target figures Twitter set for itself for next year might seem underwhelming -- like increasing U.S. leadership roles at Twitter for non-White or Asian employees from "none" to 6 percent, or upping the proportion of Latino or Black employees from 10 percent to 11 percent (but still below its 12 percent rate in 2014). But in publicly spelling out quantifiable diversity targets, Twitter put its data where its mouth is.

That late-summer transparency report wouldn't be the last time Twitter would make headlines concerning diversity, however. In the fall, Leslie Miley, an ex-Twitter employee who was the only Black senior-level engineer at the company during his tenure, posted a post on his Medium blog criticizing the company's homogenous culture.

As Latin Post reported, Miley saw the culture of Twitter's leadership as non-inclusive and homogenous, linking the company's lack of innovation and growth to its lack of diversity in leadership.

"Any change would be approved by people who all think alike," wrote Miley. "There was very little diversity in thought and almost no diversity in action."

Miley also lamented his efforts to propose new ways of increasing diversity in his division, which he said met with resistance, apathy, or lazy thinking from the Senior VP of Engineering -- who Miley charged had once responded to his concerns by saying, "diversity is important, but we can't lower the bar."

Siminoff now joins Twitter after it has already announced goals for 2016 and weathered a bad year, both with diversity advocates and the company's investors. Besides announcing the change, Twitter has not commented further on Siminoff's new role, but skeptics abound on the company's own platform.