Helping CA consumers with their Business Legal Needs. Affordable Rates. Call Today at 925-786-3426 for a Free Consultation. When you're successful we're successful.

Firm Overview

As an established full-service business law practice, Antero, Tormey & Petrin has represented a broad range of clients from Fortune 500 companies to regional and local business interests, as well as individuals. Our services include corporate formation, business startups, contracts, entrepreneurship, patents, trademarks, copywrite, technology licensing, corporate governance, franchising, and international transactions. All of our attorneys have been, startup owners and business people themselves. We know because we have been there.

Main Office

Main Office


(925) 786-3424


(925) 786-3424


Free Initial Consultation?

Our initial consultation is always free. If we can't help we are not going to charge you for it.

Services Offered For Fixed Fees?

Business formations and Trademarks are at fixed rates. If we can we make sure that you know how much you will be paying for our services before we start. We hate being nickeled and dimed so we will not do the same to you.

Hourly Rates


Office Information

Office Hours

9:30 AM - 6:00 PM

Emergency After Hours


Languages Spoken



Antero, Tormey & Petrin has represented a broad range of clients from Fortune 500 companies to regional and local mom and pop businesses. We pride ourselves on working with you to grow your business. Mike's focuses on entrepreneurship and startups.

Our attorneys have a broad range of business experience in both the corporate world and as entrepreneurs themselves. We combine that business experience with legal expertise to deliver quality counsel both in the boardroom and courtroom, so both your business needs and financial goals are met. As former business people, we know the importance of budget and how not to nickel and dime you for every call, email, or check in. If we know the answer, we tell you. If we don't, and it requires specialized knowledge we charge. We try to do as much as we can on a flat rate and most importantly we care about you and your business. How you do matters to us. The more successful you are the more successful we are.

Mike Kasin


Michael Kasin has many wide-ranging interests and business experiences. Prior to law school, Mike was the owner of a successful children™s consignment store in downtown Livermore. Before that an extensive background in real estate, including a realtor, notary, and loan officer. Mike maintains his real estate license and still gets a thrill every time he helps new buyers or sellers achieve their homeownership goals.
As well as real estate Mike's legal focus is on business law and startups.

Mike is also a playwright, producer, artistic director, and professional actor. People in the Bay Area may know him from his stage appearances for the Sonoma Shakespeare Festival, Diablo Light Opera Company, and Role Players at the Danville Village Theater. His movie credits include The Pursuit of HappinessÂť with Will Smith. In his spare time, you will find Mike performing, producing, or volunteering for numerous causes he believes in.
Mike received his Juris Doctorate from John F. Kennedy University in Pleasant Hill and his Bachelor of Fine Arts degree from New York University.

Having been there himself, Mike is particularly keen on helping start-ups grow, properly protecting intellectual property through, patent, trademark, and copyright, and in helping visionaries realize their dreams.


Bar Number: 318739
California, 2017


New York University
Bachlor of Fine Arts, 2003

John F. Kennedy University
Juris Doctorate, 2016

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