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Jeffrey Master
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Gregory Edgeworth
You did not kill Mr. Dover. ...Can I take your word for it?
Jeff Master
Yes. That is correct. I did not kill him. No matter what happens, I would never take another person's life.
Gregory Edgeworth
..... (Those aren't the eyes of a liar.) I understand. I believe you.

Jeffrey Master is a famous pastry chef who was widely considered to be number one in the world in his heyday. Alongside his adoptive daughter Katherine Hall, Master hosted a television program titled Piece of Cake, in which the pair would sing and dance while making confectionery goods. However, all this ended after he was falsely convicted for the so-called IS-7 Incident.

Gain and loss


The title card for Piece of Cake.

Master was the heir to the Master Group, a large pharmaceutical company. However, he instead wished to become a pastry chef, which his parents encouraged before their deaths. He achieved this dream and soon became widely regarded as the world's greatest pastry chef. He even had his own television program called Piece of Cake, which he hosted together with his adoptive daughter Katherine Hall, whom Master had found abandoned as a baby in front of his mansion back on a snowy Christmas Eve in 1984. The pair also shared an appreciation for the works of Pierre Hoquet, a French sculptor.

Despite becoming a pastry chef, Master was still the heir to the Master Group. A "recipe book" of experimental drugs not yet available to the general public was left in his care, which included cures for both hypogeusia and ageusia. Knowing that the book was highly sought after, he decided that he would give it to someone he respected. To this end, he held a competition at his mansion to see who was the greatest pastry chef in the world, with the recipe book as the prize. The Master Group disapproved of this and sent Delicia Scones undercover in an attempt to win the contest.

The contest

Main article: IS-7 Incident

The finals of Master's contest were held on Christmas Eve 2000, with only four contestants remaining: Isaac Dover, Dane Gustavia, Delicia Scones, and himself. Peculiarly, during the semifinals, the entries from Dover and Gustavia tasted exactly the same, despite the designs being different. The following day, Master found that Scones' finals entry used inedible props, and confiscated two lamps made of rock salt and stored them in his room. Master then had tea with Hall and Scones at 1:30 p.m. while the other contestants finished their works.

Master prepared a camera for the judging, but curiously, there was not enough film, so he had Hall fetch more. When the judging started at 3:00, Gustavia's entry (in contrast to the semifinals) was found to be lacking in both design and taste, while Dover's entry, a set of frozen sherbet sculptures modeled after the zodiac, excelled in both. Disaster struck when Hall found Dover murdered in Master's room, leading to his arrest for the crime. He contacted defense attorney Gregory Edgeworth, who agreed to take his case.

Master's hair turned white from lack of chocolate and the mental stress of the relentless questioning by prosecutor Manfred von Karma. He found the salt beef and stew served in prison completely tasteless. When Edgeworth told him that part of Dover's sculptures was salty for some reason, Master realized that he had a form of hypogeusia that prevented him from tasting salt. Though Edgeworth ensured Master that he would be able to secure an acquittal, Master knew that he would not be around for Hall forever, and told her to live her own life instead of doing everything for his sake.

Edgeworth claimed in court that Dover's body was not under police custody, but had gone missing. However, despite his best efforts, the trial continued for a year due to the police continuing to claim that the body had not gone missing. Master eventually broke when he was told that Hall would be indicted in his place if he did not confess, and he falsely confessed to being an accomplice to the murder. Nonetheless, with the help of detective Tyrell Badd, Edgeworth proved that the confession had been coerced, and although Edgeworth was unable to acquit Master, the trial left von Karma with the only penalty in his career. After his conviction, Master lost the Master Group's support and Hall was kicked out of his mansion by Master's remaining living relatives. The recipe book was also confiscated by the Group.


In the following 18 years, Master endeared himself to both his guards and fellow prisoners by creating delicious confectionery items for them every day. Although Edgeworth was murdered shortly after the trial, his assistant Eddie Fender took over Master's case and visited him regularly. Hall also visited Master every day to bring him chocolate. She became an actress, with the aim of saving up enough money to buy Master's mansion from his relatives.

Hall succeeded in her goal 18 years after Master's arrest when she bought the mansion and turned it into the "Zodiac Art Gallery", an art gallery dedicated to the works of Pierre Hoquet. However, part of her reason for doing so was to get revenge upon the true culprit of the IS-7 Incident. She set up a trap to kill the culprit with toxic gas, with Gustavia taking the bait but managing to survive. Through this, Gregory Edgeworth's son Miles was able to figure out that Gustavia was the true culprit and have him arrested. Hall was also taken into custody for attempting to murder Gustavia. With their roles now reversed, Master promised to wait for her release as she had done for him.


Master is reserved, polite, generous, and dedicated to his work. Although normally serious, he is not averse to the occasional spontaneous song. He knows that everything that Hall does is for his sake, but wishes for her to instead live her own life. His favorite food is chocolate.


  • Japanese - Issei Tenkai (天海 一誠):
    • His Japanese name comes from "Tenka Ichi" (天下一) which means "the best on earth". This matches Master's reputation of being the best pastry chef. This seems to be one of the few cases where the pun in a character's name is openly acknowledged, as "Tenka Ichi" is his in-game nickname.
    • In terms of kanji, Tenkai (天海) can be translated as "heavenly ocean", fitting his chocolate dessert theme of sea voyage.
  • English (Unofficial) - Jeffrey Master:
  • Brazilian Portuguese (Unofficial) - Gustavo Mestre


Master has a tan complexion, brown eyes, and poofy hair. He wears a black suit with the sleeves rolled up and a red rose on his lapel, a white dress shirt, a red tie, a white apron, and black shoes.