Who Is Nathan Andersen? AJ Cook’s Husband, Age, Career, and Children

Nathan Andersen is an American entrepreneur best known as the husband of actress AJ Cook. Cook is famous for playing Jennifer “JJ” Jareau on Criminal Minds. Nathan has also been described as a fashion designer and adventure traveler. He and AJ married in 2001 and have two sons, Mekhai and Phoenix.

Quick Facts

Who Is Nathan Andersen?

Nathan Andersen is the longtime husband of Canadian actress AJ Cook.

He has kept a lower public profile than his wife. Older reports describe him as a businessman, fashion designer, and adventure travel enthusiast.

Nathan is also reportedly connected with Walter Sky, a clothing brand he started with his brother.

Nathan Andersen’s Age and Birthday

Nathan’s reported date of birth is May 25, 1978.

If that date is correct, he is 48 years old in 2026.

His reported zodiac sign is Gemini.

The May 1978 birth date comes mainly from secondary biographical reporting and is not independently confirmed by the newer information available about him.

Where Was Nathan Andersen Born?

Nathan was reportedly born in the United States and is American.

His exact city and state of birth are not publicly confirmed in the available information.

Nathan Andersen’s Parents

Nathan has shared little public information about his parents.

An older biography reports that his father was an athlete who later became an international entrepreneur.

His father’s name, sport, and business are not given. Reliable information about Nathan’s mother is also unavailable.

Does Nathan Andersen Have Siblings?

Nathan reportedly has a brother named Wesley Andersen.

The brothers have been linked to the creation of Walter Sky.

Little other reliable information about Wesley is publicly available.

Nathan Andersen’s Childhood

Older reports describe Nathan as active and adventurous from a young age.

He reportedly enjoyed climbing, collecting things, and exploring.

His family is said to have supported these interests. His interest in outdoor activities later became part of his public image as an adventure traveler.

Detailed information about where he grew up is not available.

Nathan Andersen’s Education

Nathan reportedly attended Utah Valley University in Orem, Utah.

He studied film, according to available reports.

His time at the university is particularly important because this is reportedly where he met his future wife, AJ Cook.

How Did Nathan Andersen Meet AJ Cook?

Nathan and AJ reportedly met while attending Utah Valley University.

More specifically, reports say they first met in a film class.

Their relationship began years before Cook became widely known for Criminal Minds.

Nathan was therefore already part of her personal life while her acting career was still developing.

When Did Nathan Andersen Marry AJ Cook?

Nathan Andersen and AJ Cook married on August 3, 2001.

They celebrated their 25th wedding anniversary in 2026.

Their marriage began about four years before AJ joined Criminal Minds in 2005.

In a 2017 anniversary post, AJ reflected on how young they were when they married and discussed the good and difficult periods they had experienced together.

Who Is AJ Cook?

AJ Cook is a Canadian actress best known for playing Jennifer “JJ” Jareau in the crime drama Criminal Minds.

Her other screen credits include The Virgin Suicides and Final Destination 2.

Her role as JJ became the biggest part of her television career. She later returned to the character in Criminal Minds: Evolution.

Nathan and AJ were already married before Criminal Minds made her widely known to television audiences.

What Does Nathan Andersen Do?

Nathan has been described as an entrepreneur and fashion designer.

He reportedly tried working in entertainment after finishing his education.

However, he later decided that business was a better fit for him.

The available information does not provide specific film or television production credits for Nathan.

Nathan Reportedly Worked in Hollywood

After university, Nathan reportedly entered the Hollywood entertainment industry.

His exact job during this period is not publicly documented.

There are no specific movies, television shows, or production credits connected with this early career in the available sources.

He reportedly left the entertainment business after deciding to focus on other interests.

His Work With a Startup

After leaving entertainment, Nathan reportedly became involved with a friend’s startup company.

An older biography says he invested both time and money in the business and remained involved for about 10 years.

The company’s name and Nathan’s exact position are not publicly identified in the available information.

Nathan Andersen and Walter Sky

Nathan has been reported as a founder of Walter Sky, a clothing line.

His brother Wesley Andersen was reportedly involved in creating the business with him.

The idea was said to be influenced by Nathan’s interest in travel and adventure.

However, newer information does not clearly establish Walter Sky’s current ownership or operating status. It is therefore safer to describe Nathan as reportedly connected with or a founder of Walter Sky rather than assume he still runs the company in 2026.

His Interest in Travel and Adventure

Nathan has also been described as an adventure travel enthusiast.

Older social media coverage connected him with travel, outdoor activities, and exploring different places.

His reported childhood interest in climbing and exploring also fits with his later interest in adventure travel.

Nathan Andersen and AJ Cook’s Children

Nathan and AJ have two sons:

• Mekhai Allan Andersen
• Phoenix Sky Andersen

Both boys have appeared on Criminal Minds.

Who Is Mekhai Allan Andersen?

Mekhai Allan Andersen is Nathan and AJ’s older son.

He was born on September 13, 2008, according to reports citing PEOPLE.

Mekhai has a direct connection with his mother’s television career.

He appeared on Criminal Minds as Henry LaMontagne, the son of AJ Cook’s character JJ.

Who Is Phoenix Sky Andersen?

Phoenix Sky Andersen is Nathan and AJ’s younger son.

He was born on July 23, 2015, according to reports citing PEOPLE.

Like his older brother, Phoenix appeared on Criminal Minds.

He played Michael LaMontagne, another son of JJ.

Their Sons Appeared on Criminal Minds

AJ Cook’s real family became connected with her fictional family on Criminal Minds.

Mekhai played JJ’s son Henry, while Phoenix played JJ’s son Michael.

AJ’s real pregnancies were also incorporated into parts of her character’s storyline.

Nathan himself did not become a regular actor on the show.

Nathan Andersen’s Cancer

Nathan is a cancer survivor.

AJ Cook publicly discussed his cancer battle and announced in September 2019 that he was cancer-free.

The family had reportedly gone through a difficult period during his illness.

The type of cancer has not been publicly confirmed in the available information.

There is also no reliable information here about the stage, treatment, doctors, or hospital involved.

Nathan Andersen’s Public Appearances

Nathan sometimes attends public events with AJ and their children.

He attended the AltaMed Power Up, We Are The Future Gala with AJ at the Beverly Wilshire Four Seasons Hotel.

Nathan, AJ, Mekhai, and Phoenix also attended the premiere of Paramount Pictures’ Wonder Park at the Regency Bruin Theatre in March 2019.

Despite these appearances, Nathan generally maintains a more private public life than his wife.

Nathan Andersen’s Social Media

Nathan has been publicly associated with the Instagram username @nathanandy.

AJ also tagged that account in older posts about their marriage and his recovery from cancer.

His older social media activity reportedly included posts related to family, travel, and adventure.

The current status of the account in 2026 is not confirmed by the available information.

Nathan Andersen’s Net Worth

Nathan Andersen’s personal net worth is not reliably known.

One online estimate placed his net worth at $4 million in 2020, but there are no verified financial records supporting that figure.

His business income, investments, assets, and current ownership stake in Walter Sky are not publicly established.

The $4 million figure should therefore be treated only as an unverified estimate.

What Is Nathan Andersen Doing Now?

Nathan continues to be known publicly as AJ Cook’s husband and the father of their two sons.

Older reports connect his career with entrepreneurship, fashion, Walter Sky, and adventure travel.

However, reliable information about his exact professional activities in 2026 is limited.

Interesting Facts

• Nathan Andersen is American.
• His reported birthday is May 25, 1978.
• He reportedly attended Utah Valley University.
• He studied film, according to secondary reports.
• He reportedly met AJ Cook in a film class.
• Nathan and AJ married on August 3, 2001.
• Their marriage began before AJ joined Criminal Minds.
• They have two sons, Mekhai and Phoenix.
• Mekhai was born in 2008.
• Phoenix was born in 2015.
• Both sons appeared on Criminal Minds as JJ’s children.
• Nathan has been described as an entrepreneur and fashion designer.
• He was reportedly involved in a startup for about 10 years.
• He has been linked to the clothing brand Walter Sky.
• His brother is reportedly Wesley Andersen.
• Nathan is interested in travel and outdoor adventure.
• He survived cancer and was publicly described as cancer-free in 2019.
• He has been associated with the Instagram username @nathanandy.
• His personal net worth is not reliably known.

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