Luis Vargas Valdivia

S. John Ryan is a partner in Seward & Kissel’s Employee Benefits Group. He joined the Firm in 1998. John advises a variety of clients — publicly and closely held corporations, partnerships, governmental entities, tax-exempt foundations and sole proprietorships — concerning all aspects of employee benefits matters. These matters include representation involving the structuring, drafting, operation, amendment and termination of qualified and non-qualified pension, profit-s...

Danielle Thompson Williams is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation, Litigation - Intellectual Property and Litigation - Patent. Danielle Thompson, who practices law in Charlotte, North Carolina, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Danielle Thompson is held by other top lawyers in the same geographic and legal practice area.

Kayci D. Petenko is a top attorney recognized by Best Lawyers in the practice area(s) of Nonprofit / Charities Law. Kayci D., who practices law in Philadelphia, Pennsylvania, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kayci D. is held by other top lawyers in the same geographic and legal practice area.

Joshua L. Oppenheimer is a top attorney recognized by Best Lawyers in the practice area(s) of Gaming Law. Joshua L., who practices law in Albany, New York, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joshua L. is held by other top lawyers in the same geographic and legal practice area.

Terri Imbarlina Patak is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Labor and Employment. Terri Imbarlina, who practices law in Pittsburgh, Pennsylvania, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Terri Imbarlina is held by other top lawyers in the same geographic and legal practice area.

Mary Carole Young is a top attorney recognized by Best Lawyers in the practice area(s) of Insurance Law, Litigation - Insurance, Medical Malpractice Law - Defendants, Personal Injury Litigation - Defendants and Product Liability Litigation - Defendants. Mary Carole, who practices law in Little Rock, Arkansas, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Mary Carole is held by other top lawyers in the same ge...

Professional Experience David Corey is a trial attorney who exclusively defends physicians and hospitals against medical malpractice lawsuits and professional licensing proceedings. Dave has tried 19 medical malpractice jury trials, in addition to numerous other civil jury trials, bench trials and arbitration hearings and administrative hearings. Dave frequently represents physicians in licensing proceedings before the Washington Medical Commission. Prior to private practice, Dave was a crimi...

With nearly 20 years of experience, Sheela practices in the areas of water planning, water adjudications, water quality permitting and environmental compliance. Her clients include municipalities, special districts, mining companies, developers, trade associations, and a wide variety of businesses regulated by the government. By taking a collaborative and reasonable approach, Sheela has a track record of successfully negotiating agreeable resolutions between her clients, state and federal age...

Mark Hagedorn advises on a wide variety of intellectual property matters, including patent, trademark and copyright solicitation and IP litigation, licensing and counseling. Appreciated for his honesty and practical legal advice, Mark consistently delivers utilitarian solutions that help his clients resolve disputes and litigation efficiently and economically. Mark offers broad experience in virtually all phases of IP counseling and litigation. He understands and has represented clients invol...

A member of the trial bar for over 50 years, Jim has unparalleled experience and skill in preparing and presenting cases for adjudication – whether by jury, judge, arbitrator, mediator or the parties themselves. He represents Silicon Valley companies with commercial, trade secret and intellectual property issues. Jim also represents individuals in a wide variety of matters, including civil rights actions, employment disputes, family law and criminal defense.