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In a trial that began in late January and was supposed to take 20 court days, plaintiffs in Vergara v California used the first 16 to put on their case, as Superior Court Judge Rolf Treu heard from 22 witnesses through yesterday. Testimony from several others became part of the case record through their depositions.

Today, the defense begins its counter-arguments as the trial is now expected to stretch well into March.

Here are the witnesses through whom the plaintiffs tried to show that five state laws governing teacher employment deprive California school children a quality education:

John Deasy, LAUSD Superintendent

Raj Chetty: Harvard Professor of Economics

Larissa Adam: a veteran teacher in Oakland.

Troy Christmas: Director of Labor Relations for the Oakland Unified School District

Jonathan Raymond: former Superintendent of Sacramento City Unified School District

Bhavini Bhakta: elementary school teacher

William Kappenhagen: former principal in a San Francisco high school

Mark Douglas: a 37-year veteran of public education in California

Thomas Kane: education policy researcher

Kareem Weaver: former Oakland teacher and principal

Jonathan Moss: former Teach for America teacher in Compton

Maggie Pulley: public and charter school elementary grades teacher

Jose Macias: father of plaintiff Julia Macias, a middle school student

Brandon DeBose: plaintiff and high school student

Beatriz Vergara: plaintiff and high school student

Elizabeth Vergara: plaintiff and high school student

Raylene Monterroza: plaintiff and high school student

Nicolas Melvoin: former Teach for America teacher in Watts

Dan Goldhaber: a labor and education policy researcher

Arun Ramanathan: policy anaylist, now head of Education Trust-West

Susan Moore Johnson: professor of Education at Harvard*

Sandi Jacobs: state policy director at the National Council on Teacher Quality

Frank Fekete: Education law lawyer

*Defense witness, who testified early to avoid scheduling conflict