A courtroom is run by a small group of people with clearly defined jobs. The main courtroom roles are the judge, the court clerk, the bailiff, the court reporter, the two parties (plaintiff or prosecution on one side, defendant on the other), their attorneys, the jury, the witnesses, and, when a party or witness needs one, a court interpreter. Each role exists to keep the proceeding fair, orderly, and on the record.
The Judge
The judge controls everything that happens in the courtroom: ruling on whether evidence can be shown to the jury, resolving legal disputes between the attorneys, managing the trial’s pace, and ensuring both sides get a fair hearing. Federal judges are bound by the Code of Conduct for United States Judges, which sets ethical standards on impartiality, diligence, and avoiding even the appearance of impropriety.1United States Courts. Ethics Policies State court judges follow comparable judicial canons adopted by their own jurisdictions.
When no jury is present, the judge also serves as the fact-finder, weighing the evidence and reaching a verdict. In jury trials, the judge still decides questions of law and instructs the jury on how to apply legal standards to the facts. If a party disobeys a court order or disrupts the proceedings, the judge can hold that person in contempt. Federal courts have broad authority to punish contempt through fines, imprisonment, or both.2Office of the Law Revision Counsel. 18 USC 401 – Power of Court For certain categories of criminal contempt, the maximum penalty is a $1,000 fine and six months in jail.3Office of the Law Revision Counsel. 18 USC 402 – Contempts Constituting Crimes Every ruling the judge makes goes into the formal record, which an appellate court can later review for errors.
Magistrate Judges
Not every federal proceeding is handled by a district judge with a lifetime appointment. Magistrate judges serve renewable eight-year terms and take on work that district judges delegate. In criminal cases they can issue warrants, preside over arraignments, and try misdemeanor charges if the defendant consents. In civil cases they can oversee the entire trial, but only when all parties agree.4United States Courts. Types of Federal Judges The procedural rules in a magistrate’s courtroom are the same, but the scope of the magistrate’s authority is narrower than what a full Article III judge can do unilaterally.
The Clerk and the Bailiff
The court clerk keeps the official record of the case. Every motion filed, every order issued, and every judgment entered passes through the clerk’s office, which assigns case numbers, maintains the docket, and tracks deadlines. The clerk also administers the oath to witnesses before they testify, placing them under the legal obligation to tell the truth. In courthouses that handle thousands of cases at a time, the clerk’s office is the organizational backbone that prevents filings from getting lost or deadlines from being missed.
The bailiff handles physical security and courtroom decorum. Bailiffs are typically law enforcement officers who monitor the gallery, escort defendants in custody, and step in if anyone becomes disruptive. When a jury is present, the bailiff coordinates the jurors’ movements to and from the deliberation room, making sure they have no unauthorized contact with the public, the media, or the attorneys. That separation matters because even a casual remark from a bystander could compromise a juror’s impartiality.
The Court Reporter
Someone has to capture every word spoken in the courtroom, and that job falls to the court reporter. Federal law requires that court sessions be recorded verbatim, whether by shorthand, stenography machine, electronic sound recording, or another approved method.5Office of the Law Revision Counsel. 28 USC 753 – Reporters The resulting transcript is the only official account of what happened at trial, and it becomes the foundation for any appeal. The reporter can also read back testimony on request if the judge, jury, or an attorney needs to hear something again, and after the proceedings the reporter certifies the transcript and files it with the clerk.
The Two Sides: Plaintiff, Prosecution, and Defendant
Every case has two core sides. In a civil lawsuit the person or entity bringing the claim is the plaintiff, sometimes called the petitioner. In a criminal case the government fills that role as the prosecution. On the other side is the defendant, or respondent in some civil contexts, who answers the allegations and mounts a defense.
The side bringing the case carries the burden of proof, but that burden is heavier in some cases than others. In most civil disputes the plaintiff needs to show that the claim is more likely true than not, a standard called preponderance of the evidence. In criminal prosecutions the standard jumps to beyond a reasonable doubt, which is the highest burden in the legal system.6Legal Information Institute. Burden of Proof The gap between those two standards is enormous. A civil plaintiff can win with a 51 percent probability. A prosecutor has to eliminate reasonable doubt in every juror’s mind. That difference explains why someone can lose a civil case and win a criminal case on the same set of facts.
The Attorneys
Attorneys do the heavy lifting of translating a client’s situation into legal arguments the court can act on. That includes drafting motions, examining witnesses, objecting to improper evidence, and making opening and closing statements. Attorneys are officers of the court, which means they owe duties not just to their client but also to the legal system itself: they cannot knowingly present false evidence or mislead the judge.
On the criminal side, prosecutors represent the government. Their job is not simply to win convictions but to seek justice, which includes disclosing evidence that helps the defendant. Defense attorneys, whether privately retained or appointed by the court, advocate exclusively for the accused. The Sixth Amendment guarantees the right to counsel in criminal prosecutions, and the Supreme Court held in Gideon v. Wainwright that any person too poor to hire a lawyer cannot be assured a fair trial unless one is provided at government expense.7Congress.gov. U.S. Constitution – Sixth Amendment That right attaches whenever a conviction could result in imprisonment, including cases where the sentence is suspended or converted to probation.8Congress.gov. Amdt6.6.2.2 Modern Doctrine on Right to Have Counsel Appointed
Representing Yourself
You are allowed to handle your own case without an attorney in any federal court.9Office of the Law Revision Counsel. 28 USC 1654 – Appearance Personally or by Counsel Going pro se, as it’s called, is more common in civil matters. Courts hold pro se litigants to the same procedural rules as attorneys. Clerk’s office staff can help with logistics like filing deadlines and docket numbers, but they cannot give legal advice or help you figure out which claims to bring. In criminal cases, you generally cannot represent yourself without the court first confirming that you understand what you’re giving up by waiving your right to counsel.
The Jury
The jury is the group of ordinary citizens who decide the facts. In federal criminal cases the default is twelve jurors, though the parties can agree in writing to a smaller panel.10Legal Information Institute. Federal Rules of Criminal Procedure Rule 23 – Jury or Nonjury Trial In federal civil cases, juries can range from six to twelve members. State courts set their own rules, and some allow as few as six jurors even in criminal trials. Jurors hear the evidence, receive legal instructions from the judge, then deliberate in private until they reach a verdict.
A grand jury serves a completely different function. It meets before any trial to decide whether enough evidence exists to formally charge someone with a crime. A federal grand jury has between 16 and 23 members.11Legal Information Institute. Federal Rules of Criminal Procedure Rule 6 – The Grand Jury If the grand jury finds probable cause, it returns an indictment and the case moves toward trial. Grand jurors do not decide guilt or innocence.12United States Courts. Handbook for Federal Grand Jurors
How Jurors Are Chosen
Before a trial jury hears a single word of testimony, both sides get to shape its composition through a process called voir dire. The judge and sometimes the attorneys question potential jurors about their backgrounds, biases, and connections to anyone involved in the case. The goal is to identify people who cannot be impartial and remove them.13U.S. District Court, Southern District of New York. The Voir Dire Examination
There are two ways to remove a potential juror. A challenge for cause requires a specific reason, like a personal relationship with a party or an admitted bias, and the judge decides whether to grant it. There is no limit on for-cause challenges. A peremptory challenge lets an attorney strike a juror without giving any reason at all, but each side gets a fixed number. In a federal felony case the defense gets 10 peremptory challenges and the prosecution gets 6. In capital cases each side gets 20. In misdemeanors each side gets 3.14Justia Law. Federal Rules of Criminal Procedure Rule 24 – Trial Jurors
Peremptory challenges have one hard limit: they cannot be used to strike jurors based on race. The Supreme Court established that rule in Batson v. Kentucky, holding that the Equal Protection Clause forbids a prosecutor from removing potential jurors solely because of their race.15Justia U.S. Supreme Court. Batson v. Kentucky, 476 U.S. 79 (1986) That prohibition now applies to both sides in criminal and civil cases.
Witnesses
Witnesses provide the raw factual material the jury or judge uses to reach a decision. A lay witness testifies about things they personally saw, heard, or experienced. They cannot offer opinions on technical subjects outside their everyday knowledge. An expert witness is brought in specifically because of specialized training or experience. Federal Rule of Evidence 702 requires the expert to demonstrate that their testimony is based on sufficient facts, reliable methods, and a sound application of those methods to the case.16Legal Information Institute. Federal Rules of Evidence Rule 702 – Testimony by Expert Witnesses
Every witness testifies under oath, and lying carries real consequences. Federal perjury carries a maximum sentence of five years in prison.17Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally Both sides get to question each witness. The attorney who called the witness conducts direct examination, and the opposing attorney follows up with cross-examination designed to test credibility and highlight weaknesses in the testimony.
Court Interpreters
If a party or witness does not speak English fluently or has a hearing impairment, the court must provide an interpreter so they can meaningfully participate. In federal proceedings the presiding judge is required to appoint a certified interpreter, or an otherwise qualified one when no certified interpreter is available, whenever a party, defendant, or witness cannot adequately understand the proceedings or communicate with counsel.18Office of the Law Revision Counsel. 28 USC 1827 – Interpreters in Courts of the United States The same statute covers sign language interpreters for individuals who are deaf or hard of hearing.
Federal court interpreters for Spanish go through a rigorous two-phase certification exam covering written proficiency and oral performance across three modes: sight translation, simultaneous interpretation, and consecutive interpretation.19United States Courts. Federal Court Interpreter Certification Examination For languages other than Spanish, courts use a qualification process rather than a formal certification exam. Interpreters are expected to convey everything said without editing, summarizing, or adding anything. They are neutral participants, not advocates for either side.