Aleksei A. Navalny, the outspoken activist who Russian authorities said died in prison on Friday, was born on June 4, 1976, according to his website, and grew up outside Moscow to liberal parents who opposed Soviet rule.

Starting his political career as an anticorruption blogger who organized street protests, Mr. Navalny mobilized a generation of young Russians through social media and rose to prominence for investigations into Russia’s elite.

Here’s a look at Mr. Navalny’s career:

2000

Mr. Navalny, who had studied law and finance and worked as a real estate lawyer, joined the liberal Yabloko party the same year that Vladimir V. Putin was first elected president of Russia. Looking to organize grass-roots opposition to the Kremlin, he took aim at what he called lawless Moscow construction projects, moderated political debates, started a radio show and criticized pro-Putin tycoons on a widely read blog.

2011