Mr. Sfard makes no apologies for his dual role as legal advocate and political activist. His representation of conscientious objectors came after he served 21 days in a military jail in 1998 for refusing to do reserve duty in the disputed city of Hebron. His office shelves are lined with the works and likenesses of Mohandas K. Gandhi, Nelson Mandela, the Dalai Lama and the Rev. Dr. Martin Luther King Jr. His parents met during the student uprisings at the University of Warsaw in 1968.

Mr. Sfard’s maternal grandfather, the sociologist Zygmunt Bauman, was kicked out of the university and labeled a traitor for supporting the students. His father, Leon, spent three months in a Polish prison, and avoided trial only by leaving the country.

THIS legacy is ever-present for the younger Mr. Sfard: in his firm’s conference room hangs a large photograph he took of four Soviet-era Polish police cars that were on display in Warsaw when he went there on a trip to explore his roots two years ago. The police cars were much like the ones in which his father was taken from his home in the middle of the night.

“It reminds me time and again what am I doing, and what are the dangers of being a dissident,” Mr. Sfard said. “For him, I should be a bit more thankful that this is a democracy and I have freedom of speech and I can do what I do. For me, this is the starting point, not something that I have to appreciate every day.”

Once in Israel, his father became a high-tech consultant, his mother an education professor. They raised Michael and his younger sister in a Jerusalem neighborhood filled with journalists, who debated the issues of the day in their salon. In high school, he rallied for movie theaters to be open on the Sabbath, and for peace with the Palestinians.

He served in the army as a combat medic, mostly in Lebanon, and chose law because “I don’t have what it takes to be a politician.” A side passion is literature — especially Polish poetry — and he co-wrote “The Last Spy,” a 2007 biography of Marcus Klingberg, a Polish-Israeli client of the first lawyer he worked with, who was convicted of espionage for the Soviet Union.

Mr. Sfard and his high school sweetheart have 7-year-old and 15-month-old sons, whom they adopted for social-consciousness reasons. He spent a year studying in London, a self-imposed exile from the land with which he has a love-hate relationship, but could not stay away.